# NAVLE Study Guides: How to Choose and Use Them Effectively


## Key Takeaways

- The NAVLE assesses minimum competence for entry into veterinary practice, covering diverse species (canine, feline, equine, food animal, exotic) and disciplines including public health and practice management, with a criterion-referenced pass/fail scoring system.
- Effective study guide selection hinges on matching the guide's question volume, explanation depth, species/discipline balance, and format to individual learning styles (sequential reader, question-driven learner, rapid reviewer) and knowledge gaps.
- Active recall and retrieval practice, rather than passive rereading, are critical for retention; this includes writing down recalled information, summarizing missed concepts, and creating one-sentence rules for incorrect answers.
- A structured review cycle, beginning with a diagnostic baseline, followed by content review with spaced retrieval, question-driven consolidation, and simulated examinations, is essential for comprehensive preparation.
- Monitoring progress via species-specific and discipline-specific accuracy, alongside questions completed per hour, allows for timely adjustments to study strategy, particularly when accuracy plateaus or time constraints arise.
- Error logs are crucial for identifying recurring knowledge gaps and serve as a condensed, high-yield review document for the final preparation stages, focusing on specific facts personally failed to retain.

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The North American Veterinary Licensing Examination (NAVLE) is a single, multi-day, computer-based examination that assesses whether a candidate possesses the minimum competence required for safe entry into veterinary practice. The examination is administered by the International Council for Veterinary Assessment (ICVA), which publishes the official candidate information describing the examination structure, content domains, and scoring procedures. This article provides a comparative framework for evaluating the major NAVLE study guides available to veterinary students, establishes explicit criteria for matching a guide to your learning style, and outlines a practical method for integrating a chosen guide into a broader study plan. The intended reader is a veterinary student in the clinical or didactic phase of training who is beginning to select preparation materials.

The central question this article answers is not which guide is objectively best, but rather which guide best fits your specific knowledge gaps, time budget, and preferred mode of information processing. Study guides differ substantially in their question volume, answer explanation depth, species coverage balance, and format. A guide that serves one student well may be a poor fit for another. The sections that follow first establish the examination's structural demands, then present a decision framework for guide selection, and finally describe how to use a guide as a component of a larger preparation strategy instead of as a standalone resource.

## At a Glance

| Parameter | Consideration |
|---|---|
| Examination sponsor | International Council for Veterinary Assessment (ICVA) |
| Primary content domains | Canine, feline, equine, food animal, and other species, plus public health and practice management |
| Question format | Multiple-choice, single best answer |
| Guide selection criteria | Question volume, explanation depth, species balance, format, and cost |
| Learning style match | Sequential readers vs. random-access skimmers vs. question-driven learners |
| Integration strategy | Use guides for content review, not as the sole source of clinical reasoning |
| Complementary resources | Official ICVA candidate materials, veterinary reference texts, professional practice resources |
| Common failure mode | Reading a guide passively without active recall or timed practice |

## Examination Structure and Content Demands

The NAVLE is built around a defined content outline that specifies the proportion of questions allocated to each species and clinical discipline. The [ICVA NAVLE candidate information](https://www.icva.net/navle/) describes the examination as covering a broad range of species, including dogs, cats, horses, cattle, small ruminants, swine, poultry, and exotic or non-traditional species. The examination also includes questions on public health, zoonotic disease, and practice management. A study guide must therefore provide coverage across this entire spectrum, and the balance of that coverage is a primary selection criterion.

The examination is scored on a pass/fail basis, and the passing standard is set by the ICVA based on a criterion-referenced process. This means that your performance is compared against an absolute standard of competence, not against the performance of other candidates in your cohort. The practical implication for guide selection is that you need materials that build genuine clinical competence across all content areas, not materials that merely train you to outperform peers. A guide that skimps on food animal medicine because the author assumes most candidates are small animal oriented will leave you exposed to a substantial portion of the examination.

## The Conceptual Logic of Study Guide Design

Study guides for the NAVLE fall into three broad design categories, each with a distinct pedagogical logic. The first category is the comprehensive review text, which organizes information by species and body system, presenting clinical facts in a structured outline format. The second category is the question bank, which provides thousands of practice questions with answer explanations. The third category is the condensed or rapid-review guide, which distills high-yield facts into tables, lists, and mnemonics.

Each design category targets a different cognitive process. Comprehensive texts support initial learning and structured review. Question banks support retrieval practice, which is the act of recalling information from memory instead of re-reading it. Rapid-review guides support spaced repetition and last-minute consolidation. Your choice of guide should be driven by which cognitive process you most need to strengthen. If you have completed your clinical rotations and have a solid knowledge base, a question bank will serve you better than a comprehensive text. If you are still in the didactic phase and have not yet seen many clinical cases, a comprehensive text may be necessary to build that base.

## Criteria for Selecting a Study Guide

### Question Volume and Quality

The number of practice questions in a guide matters less than the quality of the explanations that accompany them. A guide with 5,000 questions but shallow explanations will not teach you the reasoning behind the correct answer. A guide with 1,500 questions and detailed explanations that reference the underlying physiology or pathology will build transferable knowledge. When evaluating a guide, read a sample explanation for a question in a topic you know well. The explanation should tell you why the correct answer is correct and, more importantly, why each incorrect option is wrong. This discriminative reasoning is the core skill the NAVLE tests.

### Species and Discipline Balance

Review the table of contents of any guide before purchasing it. The [AAVMC veterinary education resources](https://www.aavmc.org/) emphasize that veterinary curricula vary substantially between institutions, and your guide must compensate for gaps in your own school's curriculum instead of reinforce its biases. If your clinical rotations were heavily small animal focused, you need a guide with robust food animal, equine, and public health sections. If your school had a strong production animal program, you may need to spend more time on exotic pets and non-traditional species.

### Format and Accessibility

Consider whether you learn better from a physical book, a digital platform, or a combination. Digital question banks offer the advantage of timed practice sessions that simulate the examination interface. Physical texts allow for margin notes and rapid page flipping. Some guides offer both formats, but the digital version may require a subscription that expires after a fixed period. Calculate the cost per month of access and compare that against your planned study timeline. A guide that expires before your examination date is a wasted expense.

### Evidence Base and Editorial Oversight

The [MSD Veterinary Manual, Professional Edition](https://www.msdvetmanual.com/) is an example of a peer-reviewed reference that maintains high editorial standards. When evaluating a commercial study guide, look for evidence of editorial oversight, such as named authors with veterinary degrees, a review process, and citations to primary literature. Guides that contain factual errors are worse than no guide at all, because they teach you incorrect information that you will carry into the examination and into practice. Cross-check any drug dosages or treatment protocols in your guide against a current formulary or the MSD Veterinary Manual before committing them to memory.

## Matching a Guide to Your Learning Style

### The Sequential Reader

If you prefer to read a text from beginning to end, building knowledge in a structured sequence, a comprehensive review text is your primary tool. Use it as the backbone of your study plan, reading one section per day and taking notes in your own words. The risk with this approach is that you will spend time on topics you already know well while neglecting your weak areas. To mitigate this, take a diagnostic practice test before you begin reading, and use the results to prioritize which sections to read first.

### The Question-Driven Learner

If you learn best by attempting problems and then studying the explanations, a question bank should be your primary resource. Work through questions by content area, and for each question you miss, write a one-sentence summary of the underlying concept. Review these summaries at the end of each week. This approach builds retrieval practice directly into your study routine and is well suited to the NAVLE format. The risk is that you will memorize individual questions instead of general principles, so vary the order in which you attempt questions and revisit missed topics after a delay.

### The Rapid Reviewer

If you are short on time or have a strong clinical knowledge base, a condensed rapid-review guide can serve as your primary resource. Use it to identify the highest-yield facts in each content area and to build a spaced repetition schedule. The risk is that condensed guides omit the clinical reasoning that the examination tests. Use a question bank in parallel to verify that you can apply the facts you are memorizing.

## Building a Structured Review Cycle

A study guide becomes useful only when paired with a deliberate review cycle. The ICVA publishes the official examination structure and content areas, and your guide should be mapped against that blueprint before you begin ([ICVA NAVLE candidate information](https://www.icva.net/navle/)). The sequence below works across all major guides and adapts to any study schedule.

**Week 1: Diagnostic baseline.** Take one timed block of 60 questions from your guide's question bank without prior review. Record your percentage correct by species and by discipline. This identifies your deficit areas before you invest time in content review. Most students overestimate their competence in ophthalmology and underestimate their weakness in public health and population medicine, both of which appear on the examination.

**Weeks 2 to 6: Content pass with spaced retrieval.** Read one chapter or system section per day. Close the book and write down every drug, disease, and diagnostic test you can recall from that chapter. Then reopen and correct your omissions. This retrieval step doubles retention compared with rereading alone. For each disease, record the following in your notes: signalment, pathognomonic lesion, confirmatory test, first-line treatment, and prognosis. The MSD Veterinary Manual provides peer-reviewed species-specific detail that can resolve ambiguities when your guide's text is thin ([MSD Veterinary Manual professional edition](https://www.msdvetmanual.com/)).

**Weeks 7 to 10: Question-driven consolidation.** Work through the guide's question bank in blocks of 60 to 100 questions. For every incorrect answer, write a one-sentence rule that would have prevented the error. Review these rules daily. If your guide offers explanations, read them even for correct answers, because the explanation often contains a second fact that the question did not test.

**Weeks 11 to 12: Simulated examination conditions.** Complete two full-length timed examinations using only the guide's question bank or its associated online platform. Sit in a quiet room, use only the permitted break structure, and do not pause to look up answers. Your score on these simulations is the most reliable predictor of your readiness, provided the guide's question difficulty matches the actual examination.

## Monitoring Your Progress

Track three parameters weekly. First, percentage correct by species. Second, percentage correct by discipline, with special attention to surgery, medicine, and public health. Third, the number of questions you complete per hour, which should rise as recognition improves.

| Parameter | What it detects | Action threshold |
|---|---|---|
| Species-specific accuracy below 60% | A systematic gap in one species group | Return to content review for that species before further questions |
| Discipline-specific accuracy below 55% | A reasoning or knowledge deficit in that discipline | Re-read the relevant guide chapters and redo missed questions |
| Questions per hour below 40 | Slow recognition or excessive deliberation | Practice timed blocks of 30 questions with a strict per-question time cap |
| Accuracy above 85% on a repeated block | Memorisation of specific questions instead of mastery | Switch to a different question source or reorder the question bank |

Do not chase a single overall percentage. A student scoring 70% overall may still fail if the deficits cluster in heavily weighted disciplines. The ICVA publishes the content distribution, so weight your study time proportionally to the examination blueprint ([ICVA NAVLE candidate information](https://www.icva.net/navle/)).

## When to Change Your Approach

Three failure modes indicate that your current guide or method is not working. First, if your accuracy plateaus below 65% after four weeks of consistent study, the guide's explanations are not resolving your misconceptions. Switch to a guide with more detailed answer rationales or supplement with a species-specific reference text. Second, if you find yourself memorising question stems instead of learning disease patterns, your question bank has become too familiar. Reset the bank, use a different guide's questions, or create your own questions from the content chapters. Third, if you consistently run out of time on timed blocks, your issue is test-taking speed instead of knowledge. Practice with a hard cap of 90 seconds per question and learn to flag and skip questions that require more than two passes.

## Species and Production System Adjustments

The correct study approach shifts with your clinical background and your intended practice type. Students from small animal-focused curricula must allocate extra time to food animal, equine, and poultry sections. Students from production animal programs face the reverse problem. The examination covers all species regardless of your school's emphasis, so your guide must include adequate coverage of species you did not see clinically.

For students targeting mixed or rural practice, prioritize the food animal and equine sections in your guide and supplement with the WOAH terrestrial animal health standards for reportable diseases and trade-related conditions ([WOAH terrestrial animal health code](https://www.woah.org/en/what-we-do/standards/codes-and-manuals/terrestrial-code-online-access/)). For students targeting small animal practice, the same standards matter for zoonotic disease questions, but the depth required is lower. The AVMA practice resources provide professional guidance on scope and standards that can help you calibrate how much regulatory medicine detail you need ([AVMA practice resources](https://www.avma.org/resources-tools)).

## Documentation and Error Tracking

Maintain a single error log across all study sessions. Use a spreadsheet with columns for date, question source, species, discipline, your answer, the correct answer, and the rule that would have prevented the error. Review this log every third study day. After three weeks, sort by discipline and identify which rules recur. These recurring errors represent your highest-yield study targets.

Your error log also serves as your final-week review document. The day before the examination, read only the error log and the one-sentence rules. Do not attempt to reread the full guide at that point. The log condenses your entire preparation into the specific facts you personally failed to retain, which is a more efficient final review than any textbook chapter.

## Selection Checklist

Use this checklist when comparing guides before purchase. A guide that fails three or more criteria will likely require substantial supplementation.

| Criterion | Pass threshold | How to verify |
|---|---|---|
| Question count | At least 1,000 unique questions | Check the product description or publisher website |
| Answer explanations | Explanations for every question, also incorrect answers | Review sample questions online |
| Species coverage | All major species groups represented proportionally | Compare the table of contents against the ICVA content outline |
| Discipline coverage | Public health, surgery, medicine, and theriogenology present | Scan chapter titles |
| Online platform | Timed mode and performance analytics | Request a free trial or demo |
| Editorial currency | Published or updated within the last three years | Check the copyright date |
| Question difficulty | Questions that require clinical reasoning, not simple recall | Attempt the free sample questions |

The AAVMC publishes veterinary education resources and competency frameworks that can help you assess whether a guide aligns with current curricular standards ([AAVMC veterinary education resources](https://www.aavmc.org/)). A guide that matches your school's teaching style will feel more natural, but a guide that challenges your reasoning style may ultimately prepare you better for the examination's clinical vignette format.

## Recognized Failure Modes in NAVLE Preparation

Study guides fail in predictable patterns, and early detection prevents wasted weeks. The most common failure is passive rereading. A student who has highlighted the same chapter three times and cannot produce the differential list from memory is not studying, they are rereading. The discriminating check is simple: close the book and write down everything you remember about a topic. If the output is thin, the input method is wrong.

The second failure mode is question hoarding. Students save practice questions for "when they are ready," then run out of time to use them. The ICVA candidate information describes the NAVLE as a broad assessment of clinical knowledge, and question exposure is the only reliable way to calibrate that breadth. Use questions from the first week of preparation, even if scores are low. Low early scores are diagnostic data, not failures.

The third failure mode is topic avoidance. Students reliably skip the species or disciplines they find uncomfortable, usually exotic animal medicine, public health, or parasitology. The NAVLE content distribution is published by the ICVA, and every content area appears. Avoidance creates a predictable score ceiling. Track your time per subject area weekly and force proportional allocation.

The fourth failure mode is resource hopping. Switching guides every two weeks because the current one feels inadequate prevents any resource from being used deeply. A guide's value emerges only after systematic use. Set a minimum commitment period of three weeks before evaluating a resource.

## Common Errors and Corrective Action

Less experienced students make characteriztic errors that are correctable with specific interventions.

**Error: Studying species in isolation.** Students master canine medicine, then feline, then equine, and cannot integrate across species. The NAVLE tests comparative reasoning. Corrective action: study by body system across species simultaneously. When reviewing renal disease, cover dog, cat, horse, and ruminant in one session and build a comparative table.

**Error: Memorising drug names without mechanisms.** Students recognize a drug name but cannot reason about contraindications or monitoring. The MSD Veterinary Manual structures its pharmacology by drug class and mechanism, which supports mechanistic learning. Corrective action: for every drug, state the mechanism, the monitoring parameter, and the most important contraindication before moving on.

**Error: Ignoring population medicine.** Clinical cases dominate student attention, but the NAVLE includes population health, welfare, and regulatory content. The WOAH terrestrial animal health standards and the AVMA practice resources cover reportable diseases and professional obligations that students often neglect. Corrective action: schedule dedicated blocks for public health, food safety, and regulatory medicine.

**Error: Using guides without a question bank.** Reading alone does not build test-taking stamina. Corrective action: pair any guide with timed practice questions from the first week.

## Limitations of the Evidence and Divergent Expert Opinion

The evidence base for NAVLE preparation is thinner than most students assume. No published controlled trials compare study guide brands against each other or against no guide. The ICVA publishes examination structure and content distribution, but it does not endorse any commercial preparation product. Claims that one guide is "better" than another rest on anecdote and marketing, not comparative data.

Expert opinion diverges on several practical points. Some educators advocate starting preparation six months before the examination, others argue that twelve months produces better retention. The AAVMC veterinary education resources describe competency frameworks but do not specify an optimal preparation window. Students should treat any fixed timeline as a suggestion, not a rule.

Opinion also differs on the value of group study. Some students benefit from structured accountability, while others find groups slow their individual progress. The evidence does not settle this question. A reasonable approach is to trial a study group for four weeks and measure your question accuracy and content coverage against your solo baseline.

A further limitation is the commercial nature of most guides. Publishers do not disclose their question-writing methodology or their item statistics. A guide with 5,000 questions may include many low-quality or repetitive items. Students cannot verify question quality from the packaging. The only practical check is to compare question style against the ICVA candidate information and against any official practice materials.

## Escalation and External Consultation

Certain circumstances warrant escalation beyond a study guide. If a student's practice scores plateau for more than three weeks despite consistent study, a structured review with a faculty advisor or a veterinary educator is appropriate. The AAVMC member institutions employ academic advisors who can review study plans and identify gaps that self-directed study has missed.

If a student suspects a knowledge deficit in a specific clinical area, consultation with a specialist textbook or the MSD Veterinary Manual is more productive than rereading a study guide. Guides compress information, and compression sometimes introduces oversimplification. When a concept remains unclear after two guide readings, escalate to a primary reference.

Regulatory content warrants particular care. The WOAH terrestrial animal health code and the AVMA resources describe reporting obligations and professional standards that vary by jurisdiction. A study guide may present one region's rules as universal. Students should verify any regulatory claim against their own jurisdiction's requirements before relying on it in the examination or in practice.

## Troubleshooting Table

| Observation | Likely Cause | Discriminating Check |
| --- | --- | --- |
| Practice scores flat for 3 weeks | Passive rereading or topic avoidance | Review your error log. If errors cluster in one subject, you are avoiding it. If errors are diffuse, switch from reading to active recall. |
| Running out of time on practice blocks | Question hoarding or untimed practice | Check your question log. If you have completed fewer than 200 questions after 4 weeks, you are hoarding. Begin timed blocks immediately. |
| Strong recall of facts, weak clinical reasoning | Studying species in isolation | Attempt a mixed-species case. If you cannot transfer knowledge across species, restructure your study by body system. |
| Guide feels too shallow | Oversimplification in the guide | Cross-check the topic against the MSD Veterinary Manual. If the guide omits monitoring parameters, escalate to the primary reference. |
| Conflicting regulatory information | Jurisdiction-specific rules presented as universal | Verify against the WOAH terrestrial animal health code and your local regulatory body before relying on the guide. |
| Persistent anxiety or burnout | Overtraining without recovery | Review your weekly hours. If you study more than 6 hours daily for 6 consecutive days, schedule deliberate rest and reassess your timeline. |

## Frequently Asked Questions

### How Do I Choose a Study Guide When My Budget Is Limited?

Prioritize one comprehensive question bank over multiple textbooks. The official NAVLE candidate information from the [International Council for Veterinary Assessment](https://www.icva.net/navle/) outlines the content domains, so allocate funds to a resource that covers all of them instead of species-specific deep dives. Use the [MSD Veterinary Manual](https://www.msdvetmanual.com/) as your free reference for pathophysiology and treatment rationale when a paid guide lacks depth. Library copies, shared subscriptions within a study group, and previous editions from graduating students reduce cost substantially. Avoid purchasing every recommended resource. One question bank, one concise review text, and one free reference database are sufficient for most learners.

### What Should I Do If My Study Guide Contradicts My Class Notes?

Resolve contradictions by checking the primary literature or a standard reference such as the [MSD Veterinary Manual](https://www.msdvetmanual.com/) before deciding which source to trust. Class notes reflect your curriculum's emphasis and may use different drug choices or diagnostic thresholds than a national review guide. For regulatory or public health questions, consult the [World Organization for Animal Health](https://www.woah.org/en/what-we-do/standards/codes-and-manuals/terrestrial-code-online-access/) terrestrial standards when the issue involves reportable disease or trade. Record the discrepancy in your error log with the date and both sources. If the conflict involves a drug dose or withdrawal period, consult a current formulary and note that label references supersede review guides.

### How Many Hours Per Week Should I Devote to Question Practice?

A reasonable target is 10 to 15 hours weekly during the final eight weeks, with at least half of that time spent on timed question blocks. The [ICVA candidate information](https://www.icva.net/navle/) describes the examination length and pacing, so calibrate your timed practice to match that format. Shorter daily sessions of 45 to 60 minutes maintain retention better than one marathon session per week. Adjust downward if your practice scores exceed 80 percent consistently and upward if you are scoring below 60 percent. Monitor your error categories weekly. If your accuracy plateaus for two consecutive weeks, change your review method instead of simply adding hours.

### How Do I Track Errors Without Creating an Overwhelming System?

Use a simple spreadsheet with five columns: date, species, discipline, topic, and the specific knowledge gap. The [American Veterinary Medical Association practice resources](https://www.avma.org/resources-tools) emphasize structured professional development, and the same principle applies to examination preparation. Review the log every Sunday and group errors by discipline. If 40 percent of your errors fall in pharmacology, adjust your study allocation accordingly. Do not write lengthy explanations in the log. One phrase per error is sufficient, such as "NSAID contraindication in renal disease." Revisit the log before each practice session and mentally test yourself on the ten oldest entries before starting new questions.

### Should I Use a Study Guide That Focuses on a Single Species?

Only if that species represents a documented weakness confirmed by your error log. A single-species guide cannot substitute for broad coverage because the NAVLE spans multiple species and disciplines as described in the [ICVA candidate information](https://www.icva.net/navle/). Use species-specific guides as targeted remediation for a two-week period, then return to comprehensive resources. For example, if equine medicine accounts for a disproportionate share of your errors, a dedicated equine review text may help, but it should supplement instead of replace your primary question bank. Reassess after two weeks. If your equine scores have not improved, the problem may be test-taking strategy instead of content knowledge.

### How Do I Explain My Study Plan to a Clinical Supervisor or Mentor?

Frame the plan as a structured professional development activity instead of a personal project. The [Association of American Veterinary Medical Colleges](https://www.aavmc.org/) publishes veterinary education competency frameworks that can help you articulate your goals in professional terms. State your examination date, your weekly study hours, and the specific resources you are using. Ask for guidance on clinical topics that appear frequently in practice but are underrepresented in your review materials. If you need reduced clinical hours near the examination date, propose a specific schedule with coverage arrangements. Supervisors respond better to a concrete plan with defined milestones than to a general request for time off.

## Related Clinical & Scientific Guides

* [Developing a Study Schedule for NAVLE Diagnostic Reasoning](/knowledge/veterinary-medicine/navle-exam-prep/developing-a-study-schedule-for-navle-diagnostic-reasoning)
* [Veterinary Physiology Concepts Frequently Tested on the NAVLE](/knowledge/veterinary-medicine/navle-exam-prep/veterinary-physiology-concepts-frequently-tested-navle)
* [NAVLE Clinical Rotation Preparation: What to Review Before Each Service](/knowledge/veterinary-medicine/navle-exam-prep/navle-clinical-rotation-preparation-what-to-review-before-each-service)


## References and Further Reading

- [ICVA NAVLE Candidate Information](https://www.icva.net/navle/). ICVA.
- [AAVMC Veterinary Education Resources](https://www.aavmc.org/). AAVMC.
- [MSD Veterinary Manual, Professional Edition](https://www.msdvetmanual.com/). MSD Veterinary Manual.
- [American Veterinary Medical Association Practice Resources](https://www.avma.org/resources-tools). American Veterinary Medical Association.
- [WOAH Terrestrial Animal Health Code](https://www.woah.org/en/what-we-do/standards/codes-and-manuals/terrestrial-code-online-access/). WOAH.

## Related Articles

- [NAVLE Practice Exams: How to Use Them Effectively](/knowledge/veterinary-medicine/navle-exam-prep/navle-practice-exams-how-to-use-effectively)
- [NAVLE Study Resources: A Comparative Review](/knowledge/veterinary-medicine/navle-exam-prep/navle-study-resources-comparative-review)
- [NAVLE Study Timeline: When to Start and Milestones](/knowledge/veterinary-medicine/navle-exam-prep/navle-study-timeline-when-to-start-milestones)
- [Creating Effective Study Notes for NAVLE Review](/knowledge/veterinary-medicine/navle-exam-prep/creating-effective-study-notes-navle-review)
- [Creating a NAVLE Study Group: Structure and Accountability](/knowledge/veterinary-medicine/navle-exam-prep/creating-navle-study-group-structure-accountability)

> This article is educational professional reference material for veterinary audiences. It is not a substitute for veterinary diagnosis, individual clinical judgment, current product labeling, or applicable regulatory requirements.