# Dog Allergy Testing: Kits, Blood Tests and Home Options Dog allergy testing is a group of tests your veterinarian uses to find out which environmental allergens trigger your dog's itching. It does not diagnose allergies by itself, and no blood or saliva test can diagnose a food allergy. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Quick Answer - Allergy testing identifies which allergens a dog is sensitized to. It helps build a targeted treatment plan, usually allergen-specific immunotherapy [1][2]. - Diagnosis comes first. Your vet diagnoses allergy based on age, breed, signs, history, and by ruling out other causes. Testing comes after that [2]. - Food allergy cannot be diagnosed by a blood or saliva test. It requires a supervised elimination diet trial [1]. - At-home saliva and hair kits sold directly to owners are not the same as veterinary blood or skin tests, and their results are not well established in veterinary research. - Testing costs a few hundred dollars at minimum, and immunotherapy adds ongoing cost. Ask your vet whether the results would actually change your dog's treatment before you pay [1]. ## What Dog Allergy Testing Is and Why It Is Done Allergies happen when the immune system overreacts to something harmless, like pollen, dust mites, or a food protein. That reaction releases histamine and other chemicals, which cause redness, swelling, and itching [2]. Environmental allergy, often called atopic dermatitis, is the main target of allergy testing. The diagnosis itself is based on your dog's age, breed, signs, and history, plus ruling out other causes of itching such as parasites, infections, and thyroid disease. Testing cannot diagnose the condition. It identifies the offending allergens so your vet can build a specific immunotherapy program [2]. Allergen-specific immunotherapy (ASIT) uses a custom cocktail of allergens made for your individual dog. It is given as injections under the skin at regular intervals to desensitize the immune system. Cornell's Companion Animal Hospital recommends starting treatment for severe allergies with testing and ASIT. It usually works, but it can be cost prohibitive and some dogs do not respond well [1]. Testing is also used when owners want to know exactly what to avoid. If your dog reacts to house dust mites, you can change bedding, wash routines, and flooring. If the reaction is to a specific pollen, you can plan around the season. ### The two main veterinary tests **Intradermal allergy testing (IDAT).** Your vet injects small amounts of allergens into the skin, usually on the side of the chest, and reads the reactions. It is done under sedation or light anesthesia. This is the traditional gold standard in veterinary dermatology. **Serum allergy testing (SAT).** A blood sample is sent to a lab that measures allergen-specific IgE. Older panels used whole allergen extracts. Newer panels use molecular or recombinant allergens and can screen for hundreds of targets at once [3][4]. ### How well do the tests agree? Not perfectly. A 2026 study compared intradermal testing with two types of serum testing in 59 dogs with atopic dermatitis. Agreement between the platforms varied by allergen, and no single test matched another exactly [3]. A separate study in dogs with eosinophilic bronchopneumopathy found more positive intradermal reactions in affected dogs than in healthy controls, but no difference in serum IgE results between the groups [5]. That is why your vet interprets results alongside your dog's history, not in isolation. ### What the numbers look like In a large US dataset of 21,121 serum samples from dogs suspected of having allergies, 90.7% were sensitized to at least one allergen and 86.2% to at least one environmental allergen. House dust mites were the most common at 79.5%, followed by Hymenoptera venoms at 39.8%, meats at 21.9%, weeds at 21.5%, and tree pollens at 18.6% [4]. A smaller study from northern Italy found 71% of atopic dogs tested positive on a screening serum test. Of those, 53% reacted to both indoor and outdoor allergens, 38.8% to indoor only, and 8.2% to outdoor only. House dust mites led the indoor group [6]. ### Why food allergy is different Food allergy in dogs is diagnosed with an elimination diet trial, not a blood test. Cornell notes that multiple food trials may be needed, each requiring a careful elimination dietary plan [1]. During the trial, your dog eats a single novel protein or hydrolyzed diet for a set period, and you watch whether the itching improves. If it does, you reintroduce the old food to confirm. Serum tests can show sensitization to foods like meats, and the US dataset found meat sensitization in 21.9% of tested dogs [4]. But sensitization on a blood test does not equal a clinical food allergy. A dog can have positive IgE to chicken and eat chicken with no problem. This is the single biggest reason owners waste money on "food allergy test kits." If you want to understand how diet trials fit with other at-home strategies, see [Dog Allergy Home](/knowledge/veterinary-medicine/clinical-methods/dog-allergy-home). ## How to Prepare for Dog Allergy Testing at the Vet Preparation depends on which test your vet chooses. **For intradermal testing:** - Stop antihistamines and steroids for the period your vet specifies. These drugs suppress skin reactions and can cause false negatives. Your vet sets the exact timing based on the drug and dose. - Do not bathe your dog for a few days before the appointment unless told otherwise. - Withhold food if sedation is planned, following your vet's instructions. - Bring a list of every medication, supplement, and flea product your dog takes. **For serum testing:** - Medication withdrawal is usually less strict, but steroids and some other drugs can still affect results. Ask your vet. - Timing matters. Serum IgE levels fluctuate with allergen exposure, and one study found that seropositivity for tree and weed pollen was highest in spring and summer [7]. Another longitudinal study found modest seasonal variation in both intradermal and serum results, with autumn showing the highest positivity rates in dogs that had a seasonal component to their itching [8]. - Your vet may time the test to your dog's worst season. Do not schedule testing on your own without that guidance. **For at-home kits:** - Read what the kit actually measures before you buy. Many saliva and hair kits do not measure IgE at all. - Do not stop any prescribed medication to use a home kit. If your dog is due for routine screening bloodwork at the same visit, [What Blood Tests Does My Dog Need? A Guide to Routine Screening](/knowledge/veterinary-medicine/preventive-and-routine-care/dog-routine-blood-tests-guide) explains what those panels cover. ## What Happens During the Procedure **Intradermal testing.** Your dog is sedated or lightly anesthetized. The vet clips a patch of hair on the side of the chest and injects tiny amounts of each allergen into the skin. After a set waiting period, the vet measures the size and redness of each reaction site. Two trained readers often score the results independently, which improves reliability [3]. The whole appointment usually takes a few hours. **Serum testing.** This is a simple blood draw, often from the jugular or a leg vein. The sample goes to a reference lab. Results come back in days to a couple of weeks depending on the panel. **At-home kits.** Most involve collecting saliva with a swab or pulling a few hairs and mailing them in. You get a report by email. The problem is that these results are not validated against the veterinary tests your dermatologist uses, and there is no published agreement data showing they predict your dog's actual reactions. If you are considering a direct-to-consumer product, [Canine DNA & Sensitivity Test Kits: Genetic Health Screening, Variant Accuracy, and Panel Limitations](/knowledge/veterinary-medicine/at-home-diagnostics/dog-dna-allergy-test-kit) covers what these kits can and cannot tell you. ## Recovery Timeline and Home Care | Time after testing | What to expect | What to do | |---|---|---| | First few hours | Drowsiness from sedation after intradermal testing. Small raised bumps or mild redness at injection sites. | Keep your dog quiet and indoors. Offer water when fully awake. | | 24 to 48 hours | Sedation wears off. Skin reactions fade. Blood draw sites may show minor bruising. | Normal activity if your dog seems comfortable. Watch the draw site for swelling. | | 3 to 7 days | Skin fully back to normal. No restrictions. | Resume all medications your vet paused, on the schedule your vet gives. | | 1 to 3 weeks | Serum results arrive. Your vet reviews them and designs a plan. | Schedule a follow-up to discuss immunotherapy or avoidance steps. | | Ongoing | If immunotherapy starts, injections are given at regular intervals and adjusted over time [1]. | Keep a simple itch log so you and your vet can judge whether it is working. | Most dogs bounce back from either test quickly. The bigger commitment is what comes after, especially if you start immunotherapy. ## Possible Complications and Warning Signs Both tests are generally low risk, but complications exist. **After intradermal testing:** - Sedation reactions, including slow breathing or prolonged grogginess - Local swelling, bruising, or rare infection at injection sites - Rare systemic allergic reaction to a test allergen **After blood draw:** - Bruising or a small hematoma - Rare infection at the puncture site - Fainting or stress during the draw **After starting immunotherapy:** - Injection site swelling or itching - Increased itching or hives after a dose - Rare severe reactions Call your vet the same day if you see hives, facial swelling, vomiting, or a reaction that seems worse than expected after any injection. If your dog has trouble breathing, collapses, or has severe swelling, treat it as an emergency and go to the nearest emergency clinic. ## Questions to Ask the Veterinarian Before you spend money on dog allergy testing, ask these questions. 1. Does my dog's history actually fit an environmental allergy, or could something else be causing the itching? 2. Which test do you recommend, intradermal or serum, and why? 3. What medications do I need to stop, and for how long? 4. What will we do differently if the test is positive? 5. What is the total cost of testing plus the first year of treatment? 6. If immunotherapy is the plan, what response rate should I expect and how long before we judge it? 7. Should we do a food elimination trial first, or at the same time? 8. How will we track whether treatment is working? Question 4 is the most important one. If the answer is "nothing changes," the test may not be worth the money. ## Limitations and When to Contact a Veterinarian Allergy testing has real limits. It identifies sensitization, not clinical allergy, and no test can positively diagnose airborne allergy on its own [2]. Test platforms do not agree perfectly with each other, so a positive result on one panel may not appear on another [3]. Seasonal timing shifts results, so a test run in the wrong month can miss or overstate a pollen allergy [7][8]. And food allergy still requires a diet trial, no matter what any kit claims [1]. **Contact your vet the same day if:** - Your dog has hives, facial swelling, or vomiting after a test or immunotherapy injection - Your dog is intensely itchy, restless, or cannot settle after a procedure - The blood draw site swells, bleeds, or looks infected **Go to an emergency clinic now if:** - Your dog has trouble breathing, noisy breathing, or a swollen throat - Your dog collapses, has a seizure, or is unresponsive - Your dog has repeated vomiting with weakness or pale gums **Schedule a routine visit if:** - Itching is getting worse despite treatment - Your dog develops new sores, hair loss, or skin odor - You are unsure whether a home kit result is meaningful Individual cases vary, and only your veterinarian can evaluate your dog and set a plan. If you want to try safe comfort measures while you wait for an appointment, [Dog Allergy Home Remedies](/knowledge/veterinary-medicine/clinical-methods/dog-allergy-home-remedies) and [Dog Allergy Remedies Home Remedies](/knowledge/veterinary-medicine/clinical-methods/dog-allergy-remedies-home-remedies) cover options that do not replace testing or prescription treatment. ## Frequently Asked Questions ### Can a dog allergy test kit replace a vet visit? No. At-home kits do not diagnose allergy, and their results are not validated against the intradermal and serum tests used in veterinary practice. A veterinarian still needs to examine your dog, rule out other causes of itching, and interpret any results in context. If a kit report tells you to change your dog's entire diet or start supplements, run that past your vet first. ### Is a blood test or a skin test better for dog allergies? Neither is universally better. Intradermal testing and serum testing measure different things and do not agree perfectly with each other, so your vet picks based on your dog's health, medications, and the allergens in question. Some dogs cannot safely stop steroids for a skin test, which makes serum testing the practical choice. Ask your vet which one fits your dog. ### Why did my dog's food allergy test come back positive for chicken if chicken is fine? Because a positive IgE result means sensitization, not a clinical allergy. Many dogs have detectable antibodies to foods they eat without any problem. The only way to confirm a food allergy is a supervised elimination diet trial followed by reintroduction. Do not remove foods from your dog's diet based on a blood or saliva panel alone. ### How long does it take to get dog allergy test results? Serum results typically come back within days to a couple of weeks, depending on the lab and panel. Intradermal results are read the same day as the procedure. Immunotherapy, if you choose it, takes months before you can judge whether it is helping, and doses are adjusted over time. ### Can allergies in dogs be cured? No. Allergy is a lifelong tendency, and treatment aims to control signs, not eliminate the condition. Avoidance, medication, and immunotherapy can all reduce itching and improve quality of life. Some dogs respond very well and others respond partially, which is why your vet sets realistic expectations before you start. ## Related Articles - [Dog Allergy Home](/knowledge/veterinary-medicine/clinical-methods/dog-allergy-home) - [Dog Allergy Home Remedies](/knowledge/veterinary-medicine/clinical-methods/dog-allergy-home-remedies) - [Canine DNA & Sensitivity Test Kits: Genetic Health Screening, Variant Accuracy, and Panel Limitations](/knowledge/veterinary-medicine/at-home-diagnostics/dog-dna-allergy-test-kit) - [What Blood Tests Does My Dog Need? A Guide to Routine Screening](/knowledge/veterinary-medicine/preventive-and-routine-care/dog-routine-blood-tests-guide) - [Dog Allergy Remedies Home Remedies](/knowledge/veterinary-medicine/clinical-methods/dog-allergy-remedies-home-remedies) - [Blood Tests for Dog Anxiety: What They Can and Can't Tell You](/knowledge/veterinary-medicine/anxiety-and-behavior-support/blood-tests-dog-anxiety) ## References 1. [Allergy testing and immunotherapy](https://www.vet.cornell.edu/departments-centers-and-institutes/riney-canine-health-center/canine-health-topics/allergy-testing-and-immunotherapy). Cornell University College of Veterinary Medicine. 2. [Allergies in Dogs - Dog Owners](https://www.merckvetmanual.com/dog-owners/skin-disorders-of-dogs/allergies-in-dogs). Merck Veterinary Manual. 3. [A Novel Veterinary Molecular Multiplex Microarray Serological Allergen Test (Pet Allergy Xplorer; Nextmune) Versus Conventional Extract-Based Serological (Idexx; Stallergenes Greer Laboratories) Versus Intradermal Allergen Testing in 59 Dogs With Atopic Dermatitis: Evaluation of Agreement Between Allergy Testing Platforms](https://pubmed.ncbi.nlm.nih.gov/42543154/). Veterinary dermatology, 2026. 4. [Molecular Allergen Sensitization Profiling in a Large Cohort of Dogs Suspected of Allergic Diseases in the USA: Prevalence and Unsupervised IgE Clustering (2024-2025)](https://pubmed.ncbi.nlm.nih.gov/42589052/). Animals : an open access journal from MDPI, 2026. 5. [Intradermal testing and allergen-specific IgE testing in dogs with eosinophilic bronchopneumopathy and healthy dogs](https://pubmed.ncbi.nlm.nih.gov/42182908/). Frontiers in veterinary science, 2026. 6. [Detection of Serum Allergen-Specific IgE in Atopic Dogs Tested in Northern Italy: Preliminary Study](https://pubmed.ncbi.nlm.nih.gov/33535414/). Animals : an open access journal from MDPI, 2021. 7. [Seasonality of Serum Allergen-Specific IgE Levels in Scandinavian Dogs Suspected of Allergy](https://pubmed.ncbi.nlm.nih.gov/42357720/). Veterinary sciences, 2026. 8. [Longitudinal Analysis of Seasonal Variations in Intradermal Test Reactivity and Serum Allergen-Specific Immunoglobulin E in Dogs With Atopic Dermatitis](https://pubmed.ncbi.nlm.nih.gov/42136007/). Veterinary dermatology, 2026. ## Further Reading - [Merck Veterinary Manual: Dog Owners](https://www.merckvetmanual.com/dog-owners) - [Cornell Richard P. Riney Canine Health Center: Canine Health Information](https://www.vet.cornell.edu/departments-centers-and-institutes/riney-canine-health-center/canine-health-information) - [American Veterinary Medical Association: Pet Care](https://www.avma.org/resources-tools/pet-owners/petcare)