Capnography Waveform Interpretation in Veterinary Patients

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-08-11

Key Takeaways

• The capnogram waveform provides critical diagnostic information beyond the numeric end-tidal CO2 (EtCO2) value, enabling differentiation between patient pathology and equipment malfunction during anesthesia and critical care.
• An elevated baseline (Phase 0) indicates rebreathing, typically due to exhausted CO2 absorbent, insufficient fresh gas flow, or an incompetent inspiratory/expiratory valve, while a prolonged expiratory upstroke (Phase II) suggests airway obstruction or bronchospasm.
• A sudden loss of waveform to zero signifies a critical event such as apnea or esophageal intubation, or an equipment failure like a disconnected sampling line or occluded water trap, necessitating immediate verification of patient status and system integrity.
• The arterial-to-end-tidal CO2 gradient (normally 2-5 mmHg) widens with ventilation-perfusion mismatch (e.g., hypovolemia, pulmonary embolism), indicating increased alveolar dead space and potentially underestimating true PaCO2.
• Waveform artifacts, such as noisy tracings from water in the sampling line or damped contours from partial sampling line obstruction, must be identified and resolved before attributing changes to patient physiology.
• In small patients (e.g., rodents, neonates), high respiratory rates can exceed analyzer response times, leading to falsely low EtCO2 values and distorted waveforms, requiring careful consideration of equipment limitations and alternative monitoring.

Capnography provides a continuous, noninvasive measurement of carbon dioxide in exhaled breath, displayed both as a numeric end-tidal CO2 (EtCO2) value and as a waveform plotted against time. The waveform, or capnogram, contains diagnostic information that the numeric value alone cannot convey. This article equips the practicing veterinarian with a systematic framework for interpreting capnography waveforms in dogs, cats, and other veterinary species to distinguish respiratory pathology from equipment malfunction, and to guide timely intervention during anesthesia and critical care.

The reader is assumed to be comfortable with basic anesthetic monitoring and airway management. The focus here is diagnostic reasoning: recognizing waveform patterns, correlating them with underlying physiology, and deciding whether the problem lies in the patient or in the sampling system. Detailed ventilator management is outside the scope of this reference. The principles described apply across species, with specific notes where dogs and cats differ from laboratory rodents and other small mammals.

At a Glance

Physiologic Basis of the Capnogram

Carbon dioxide is produced in tissues, transported in venous blood to the right heart, and eliminated by alveolar ventilation. The partial pressure of CO2 in arterial blood (PaCO2) is determined by the balance between metabolic production and alveolar minute ventilation. End-tidal CO2 approximates alveolar CO2, which in turn approximates PaCO2 in the healthy patient with normal ventilation-perfusion matching.

The normal capnogram has four phases. Phase 0 is the inspiratory baseline, which should read zero because inspired gas contains no CO2. Phase I is the beginning of expiration, representing dead space gas from the trachea and bronchi that contains little CO2. Phase II is the rapid upstroke as alveolar gas mixes with dead space gas. Phase III is the alveolar plateau, where CO2 concentration reflects alveolar gas. The angle between phase II and phase III, called the alpha angle, normally measures about 100 to 110 degrees. The angle between phase III and the inspiratory descent, the beta angle, is normally close to 90 degrees.

The numeric EtCO2 value is read at the end of phase III, immediately before inspiration begins. The gradient between PaCO2 and EtCO2 is normally 2 to 5 mm Hg in dogs and cats. A widened gradient indicates alveolar dead space, where ventilated alveoli are not perfused. This occurs with hypovolemia, pulmonary embolism, and low cardiac output states.

Equipment and Sampling Considerations

Capnography systems are either sidestream or mainstream. Sidestream analyzers aspirate gas through a sampling line to a sensor located away from the airway. Mainstream analyzers place the sensor directly in the breathing circuit. Sidestream systems are more common in veterinary practice because they add minimal dead space and work with small patients, but they have a slower response time and can be affected by sampling line obstruction, water condensation, and leaks. Mainstream sensors are faster but add weight and dead space to the airway, which matters in patients under 3 kg.

Sampling rate and response time become clinically relevant in very small patients. In laboratory rodents, respiratory rates of 100 to 200 breaths per minute exceed the response capability of many sidestream analyzers, producing falsely low EtCO2 readings and distorted waveforms. The same limitation applies to neonatal kittens and puppies. When the respiratory rate exceeds roughly 60 breaths per minute, the capnogram may fail to reach a true plateau, and the displayed EtCO2 underestimates the actual alveolar value. This is a known limitation of physiologic monitoring in rodents, where anesthetic depth is often assessed by other parameters in addition to capnography.

Water trap malfunction is a common cause of waveform artifact. Condensation in the sampling line creates a slow, slurred waveform with a falsely low EtCO2. Sampling line disconnection produces a flat line at zero. A partially kinked line produces a damped waveform with a prolonged phase II and no clear plateau. Before interpreting any abnormal waveform, the clinician should verify that the sampling system is intact, the water trap is functional, and the sampling line is not kinked or obstructed.

The Normal Waveform as a Reference

A normal capnogram in a dog or cat under inhalant anesthesia shows a sharp rise in phase II, a flat or gently rising phase III, and a rapid vertical drop at the onset of inspiration. The baseline returns to zero with each breath. The waveform is stable from breath to breath, and the EtCO2 value remains within a narrow range for that patient.

The shape of the normal waveform changes with respiratory rate. At higher rates, phase II and phase III compress, and the plateau may become less distinct. This is a technical artifact of the analyzer response time instead of a true change in alveolar gas composition. The clinician should interpret waveform morphology in the context of the patient's respiratory rate and the analyzer's specifications.

A normal waveform does not guarantee normal arterial CO2. The EtCO2 value must be interpreted alongside the waveform shape. A patient with a normal waveform but a rising EtCO2 trend is becoming hypoventilated. A patient with a normal waveform and a falling EtCO2 may be hyperventilating, or may be experiencing a fall in cardiac output. The waveform alone cannot distinguish these possibilities, the clinician must integrate heart rate, blood pressure, and mucous membrane color.

Physiologic Abnormalities: Respiratory Patterns

Obstructive airway disease produces a characteriztic capnogram. Phase II becomes prolonged and less steep, and the alpha angle widens. The alveolar plateau may slope upward instead of remaining flat, because poorly ventilated alveoli empty late in expiration and contribute higher CO2 concentrations. This pattern appears with bronchospasm, airway secretions, endotracheal tube obstruction, and foreign bodies. In cats with feline bronchial disease, the waveform may show a "shark fin" appearance with a prolonged upstroke and a steep, short plateau.

Rebreathing of exhaled gas produces an elevated baseline that does not return to zero. This occurs when the CO2 absorbent is exhausted, when fresh gas flow is too low for the patient's minute ventilation, or when the inspiratory valve is incompetent. The entire waveform shifts upward, and the EtCO2 value rises. The clinician should first check the absorbent color and the fresh gas flow rate before adjusting ventilator settings.

A sudden loss of the plateau with a low EtCO2 suggests a sampling problem or a rapid, shallow breathing pattern. In a patient breathing rapidly with small tidal volumes, the analyzer may sample gas that is predominantly dead space, producing a waveform that rises and falls without a clear plateau. This is common in tachypneic cats and in rodents, and it explains why EtCO2 monitoring alone is unreliable in these patients.

Airway and Circuit Abnormalities

Obstructive Patterns

A flattened, prolonged expiratory phase with a slow rise toward the plateau characterizes expiratory obstruction. The waveform resembles a shark fin, with the upstroke delayed and the peak never reaching the expected end-tidal value. Common causes include bronchospasm, airway secretions, a kinked endotracheal tube, or a partially occluded breathing circuit. Inspiratory obstruction produces a different signature: the inspiratory downstroke becomes slurred or scooped, and the plateau may be truncated.

Differentiating upper from lower airway obstruction requires attention to the phase affected and the accompanying clinical signs. Upper airway obstruction, such as laryngeal paralysis or a foreign body, typically produces a prolonged inspiratory phase with a characteriztic sawtooth or irregular contour. Lower airway disease, including feline bronchial disease or canine chronic bronchitis, predominantly distorts the expiratory limb. When the obstruction is in the endotracheal tube itself, both phases may be abnormal, and the waveform often normalizes immediately after tube replacement or repositioning.

The capnogram cannot distinguish fixed from dynamic obstruction. A fixed lesion, such as a stricture or mass, produces a consistent pattern breath to breath. Dynamic collapse, as seen with tracheal collapse or bronchomalacia, may produce variable morphology that worsens with respiratory effort. Serial observation during spontaneous breathing versus positive pressure ventilation can help separate these entities, since dynamic lesions often improve when the patient is ventilated with a controlled pattern.

Rebreathing and Circuit Malfunction

An elevated baseline that fails to return to zero indicates rebreathing of carbon dioxide. The waveform shows an increased inspiratory baseline, and the gap between the baseline and the start of the expiratory upstroke narrows or disappears. Causes include exhausted soda lime, an incompetent expiratory valve, insufficient fresh gas flow in a Mapleson circuit, or a malfunctioning carbon dioxide absorber. In non-rebreathing circuits, inadequate fresh gas flow is the most common culprit. In circle systems, exhausted absorbent is the usual cause, and the baseline elevation progresses over time as the absorbent capacity is consumed.

A sudden loss of waveform, with the tracing falling to zero or near zero, suggests a sampling problem instead of a physiologic event. The differential includes a disconnected sampling line, a water trap occluded by condensation, a kinked sampling catheter, or accidental placement of the sampling line in the inspiratory limb. When the waveform disappears abruptly during an otherwise stable anesthetic, check the sampling system before assuming cardiac arrest or apnea. The clinical context helps: a patient with a palpable pulse and normal mucous membrane color is more likely to have an equipment failure than a catastrophic physiologic event.

Esophageal Intubation and Accidental Tracheal Extubation

Esophageal intubation produces a characteriztic capnogram with small, irregular, rapidly decaying waveforms. The carbon dioxide concentration is low, often 10 to 20 mmHg, and the waveform lacks the sharp upstroke and clear plateau of a tracheal tracing. The contour may appear rounded or blunted, and the values often decrease over successive breaths as the stomach contents are sampled. This pattern should trigger immediate laryngoscopic confirmation of tube position, since pulse oximetry may remain normal for several minutes after esophageal placement.

Accidental extubation during surgery produces a different sequence. The capnogram initially shows a normal pattern, then progressively flattens as the tube migrates into the pharynx or esophagus. The transition may be gradual, with decreasing plateau height and an irregular contour, or abrupt if the tube exits completely. The waveform changes precede oxygen desaturation, making capnography the earliest warning of tube displacement. This is particularly valuable in patients where access to the airway is limited, such as during dental procedures or head surgery, where the anesthetist cannot directly visualize the tube.

Equipment-Related Waveform Artifacts

Sampling Line Issues

Water condensation in the sampling line produces a characteriztic artifact: the waveform becomes noisy, with superimposed high-frequency oscillations that obscure the underlying contour. The tracing may appear jagged or spiky, and the numeric values may fluctuate erratically. Clearing the water trap or replacing the sampling line resolves the artifact. A partially obstructed sampling line produces a damped waveform with reduced amplitude and a rounded contour that can mimic hypoventilation. The key distinction is that the respiratory rate remains appropriate and the clinical assessment of ventilation does not match the capnogram.

Sidestream Versus Mainstream Sampling

Sidestream analyzers aspirate gas through a sampling line and measure carbon dioxide in a remote chamber. The transport delay, typically 1 to 3 seconds, creates a lag between the displayed waveform and the actual breath. At high respiratory rates, particularly in small patients, the sampling rate may be insufficient to capture the true peak, resulting in an artificially low end-tidal value. Mainstream analyzers measure directly at the airway adapter and provide real-time waveforms without transport delay, but the adapter adds dead space and weight to the breathing circuit. In patients weighing less than 3 kg, the added dead space can significantly increase rebreathing and alter the waveform. The AAHA anesthesia and monitoring guidelines for dogs and cats recommend that monitoring equipment be selected based on patient size, with particular attention to dead space in small patients.

Waveform Artifacts From Patient Movement

Movement, shivering, or surgical manipulation can produce transient waveform distortion. The tracing may show irregular spikes, dropped breaths, or a wandering baseline. These artifacts are usually self-limiting and resolve when the stimulus ceases. However, persistent irregularity during surgical stimulation should prompt evaluation for inadequate anesthetic depth, since movement under anesthesia can dislodge the sampling line or alter the breathing pattern.

Differential Diagnosis of Abnormal Waveforms

Monitoring Parameters and Interpretation

The numeric end-tidal carbon dioxide value must be interpreted in the context of the waveform. A normal numeric value with an abnormal waveform should not be trusted. Conversely, a low value with a normal waveform may indicate hyperventilation or a fall in cardiac output. The gradient between arterial carbon dioxide and end-tidal carbon dioxide, normally 2 to 5 mmHg in healthy patients, widens with ventilation-perfusion mismatch, low cardiac output, or pulmonary embolism. In patients with significant pulmonary disease, the end-tidal value may substantially underestimate the arterial value, and the waveform alone cannot quantify this gradient.

Respiratory rate displayed by the capnograph should be compared with the observed thoracic excursions. A discrepancy suggests either a sampling problem or a cardiac oscillation artifact, where the waveform shows extra peaks from cardiac pulsation transmitted through the airway. This artifact is more common in small patients and those with high cardiac output. The MSD Veterinary Manual notes that capnography provides continuous assessment of ventilation and perfusion, but the values must be interpreted with knowledge of the patient's underlying disease and the sampling method used.

Documentation and Clinical Decision-Making

Record the end-tidal carbon dioxide value, respiratory rate, and a description of the waveform morphology at regular intervals during anesthesia. Note any changes in waveform pattern, the suspected cause, and the intervention performed. This documentation supports anesthetic record keeping and facilitates recognition of trends over time. A patient whose end-tidal carbon dioxide rises progressively with a normal waveform is hypoventilating and requires adjustment of ventilation. A patient whose waveform changes from normal to shark fin during surgery may be developing bronchospasm from a drug reaction, a transfusion reaction, or progression of underlying disease.

The WSAVA Global Pain Council Guidelines emphasize that monitoring must be adapted to the individual patient and procedure. In small rodents used in research, the review of anesthesia and physiological monitoring during in vivo imaging highlights that capnography is technically challenging due to low tidal volumes and high respiratory rates, and the waveform may be unreliable. Similarly, the mouse anesthesia review notes that monitoring in mice requires equipment adapted to very small tidal volumes, and the anesthetist must recognize the limitations of the technology in these patients. For production animals, the larger tidal volumes make capnography more reliable, but the equipment must be robust enough for field conditions and the interpretation must account for the patient's position and the effects of heavy sedation or anesthesia on respiratory drive.

Recognized Complications and Early Detection

Capnography failures fall into three categories: patient deterioration, equipment malfunction, and operator error. Each has characteriztic signatures that permit early recognition before clinical decompensation.

Progressive hypercapnia with a normal waveform shape indicates alveolar hypoventilation. The waveform retains its rectangular contour but the plateau rises progressively. This pattern accompanies respiratory depression from opioid premedication, inhalant overdose, or residual neuromuscular blockade. Early detection requires trend review instead of single-point assessment. A rising baseline with an unchanged peak suggests rebreathing, while a rising peak with an unchanged baseline indicates falling minute ventilation.

Sudden waveform loss demands immediate differentiation between apnea, esophageal intubation, sampling line occlusion, and disconnection. The capnometer cannot distinguish these without additional information. Check the sampling line for kinks or fluid, verify circuit continuity, and auscultate the patient. A flat trace with spontaneous thoracic movement suggests airway obstruction or sampling failure. A flat trace with absent thoracic movement indicates apnea or anesthetic circuit disconnection.

Abrupt decrease in EtCO2 with maintained ventilation signals falling cardiac output, pulmonary perfusion, or both. This pattern accompanies hypotension, hypovolemia, pulmonary thromboembolism, or cardiac arrest. The gradient between arterial CO2 and EtCO2 widens as alveolar dead space increases. Capnography detects this deterioration earlier than pulse oximetry in many cases, because the waveform responds to perfusion changes within seconds.

Curare clefts appear as notches in the expiratory plateau during partial neuromuscular blockade. The diaphragm and accessory muscles relax intermittently, producing transient dips in CO2 concentration. This finding precedes measurable changes in tidal volume and permits earlier adjustment of neuromuscular blocking agent administration.

Common Errors and Corrective Actions

Less experienced clinicians frequently misinterpret a normal waveform as assurance of adequate ventilation. The waveform confirms airway patency and pulmonary perfusion, not minute ventilation adequacy. Arterial blood gas analysis remains the reference standard for verifying CO2 elimination, particularly in patients with pulmonary disease or abnormal chest wall mechanics.

Error: attributing a low EtCO2 to hyperventilation without assessing perfusion. A low EtCO2 with a normal respiratory rate and tidal volume should prompt evaluation of cardiac output, not adjustment of ventilator settings. Check pulse quality, blood pressure, and mucous membrane color before changing respiratory parameters.

Error: ignoring the arterial-to-end-tidal CO2 gradient. The gradient normally ranges from 2 to 5 mm Hg in healthy patients but widens with age, pulmonary disease, and positional changes. A gradient exceeding 10 mm Hg indicates significant alveolar dead space and renders EtCO2 unreliable as a sole ventilation monitor. MSD Veterinary Manual guidance emphasizes that capnography complements instead of replaces clinical assessment and blood gas analysis.

Error: treating waveform artifacts as physiologic events. Cardiogenic oscillations, which appear as small regular undulations on the plateau, reflect cardiac pulsation transmitted through the lungs. They are benign. Water droplets in the sampling line produce irregular spikes that mimic partial obstruction. Flush the line and observe whether the artifact resolves.

Error: failing to recalibrate or verify sidestream sampling rates. Low sampling flow rates delay waveform response and underestimate EtCO2 in high respiratory rate patients. High flow rates entrain room air and dilute the sample. Verify the sampling rate matches the manufacturer specification for the patient's size and respiratory rate.

Limitations of Current Evidence

The veterinary capnography literature relies heavily on extrapolation from human medicine and from laboratory animal studies. Anesthesia and physiological monitoring during in vivo imaging of laboratory rodents describes monitoring challenges in small patients where sampling volumes and response times become critical. These constraints apply to cats and small dogs, though the magnitude differs.

Species-specific reference ranges for the arterial-to-end-tidal gradient remain poorly defined. Brachycephalic breeds, patients with pleural effusion, and those positioned in dorsal recumbency show wider gradients, but published thresholds vary. Expert opinion differs on whether corrective factors should be applied to EtCO2 values in these populations or whether blood gas analysis should be mandated.

The AAHA Anesthesia and Monitoring Guidelines for Dogs and Cats recommend capnography as a standard monitor but acknowledge that evidence for improved outcomes is extrapolated from human studies. No large prospective veterinary trial has demonstrated that capnography-guided anesthesia reduces morbidity or mortality compared with clinical assessment alone.

Troubleshooting Guide

Referral and Escalation Criteria

Most capnography abnormalities resolve with equipment checks and ventilator adjustments. Persistent unexplained hypercapnia or a widening arterial-to-end-tidal gradient warrants blood gas analysis and consideration of underlying pulmonary pathology. Referral to a specialist anesthesiologist or criticalist is appropriate when the patient requires mechanical ventilation beyond the practice's capability, when neuromuscular blockade is contemplated, or when capnography abnormalities persist despite corrective intervention.

Regulatory reporting obligations arise when equipment failure contributes to patient injury or death. AVMA practice resources outline professional responsibilities for adverse event documentation and disclosure. Anesthesia-related mortality in production animals may trigger reporting under WOAH terrestrial animal health standards when reportable diseases or food safety concerns are involved. Maintain accurate anesthetic records including capnography tracings, as these documents support both clinical decision-making and medicolegal review.

Frequently Asked Questions

How do I interpret capnography when only a numeric EtCO₂ value is displayed, without a waveform?

A numeric value without a waveform should be treated as unverified data. The number can be misleading if sampling is erratic, the line is kinked, or the patient is panting. When waveform display is unavailable, corroborate the EtCO₂ with a second parameter, such as pulse oximetry, mucous membrane color, or an arterial or venous blood gas if accessible. The AAHA anesthesia and monitoring guidelines for dogs and cats recommend continuous monitoring of ventilation and oxygenation, but a single numeric capnograph reading does not confirm adequate alveolar ventilation. If the number conflicts with the clinical picture, assume an equipment problem until proven otherwise.

What can I do when a capnograph is not available or has failed mid-procedure?

When capnography is unavailable, use clinical assessment and alternative monitoring. Observe thoracic excursion, reservoir bag movement, and auscultate lung fields. Mucous membrane color and pulse quality provide indirect information about perfusion but not ventilation. In small rodents and other laboratory species, physiological monitoring during imaging and procedures is essential because anesthetic agents profoundly alter respiratory drive, as described in guidance on anesthesia and physiological monitoring of laboratory rodents. If a capnograph fails mid-procedure, disconnect the sampling line, check for obvious obstruction, and consider switching to a different monitor if one exists. Do not delay treatment of a suspected airway problem while troubleshooting equipment.

Does capnography interpretation differ between dogs, cats, and exotic or laboratory species?

The fundamental waveform shapes are consistent across species, but respiratory rate and pattern alter the display. Cats and small dogs often have rapid, shallow breathing that produces a narrower alveolar plateau. In mice and rats, mainstream sensors are impractical and sidestream sampling with very low flow rates is required, the small tidal volumes make waveforms prone to artifact, as noted in mouse anesthesia guidance. Brachycephalic dogs may show an obstructive pattern at baseline due to upper airway anatomy. In all species, the waveform must be interpreted relative to the patient's resting pattern and the anesthetic depth. A waveform that is normal for a panting dog may be abnormal for a ventilated cat under neuromuscular blockade.

How should I document capnography findings in the anesthetic record?

Record the EtCO₂ value, the waveform description, and the time of each assessment. Note the sampling method, whether the patient was breathing spontaneously or was ventilated, and any changes in position or circuit configuration. If an abnormal waveform was observed, document the suspected cause and the corrective action taken. The AVMA practice resources emphasize that accurate medical records support continuity of care and professional accountability. Include a waveform sketch or a printed strip if your monitor allows. Documenting a normal waveform is as important as documenting an abnormal one, because it establishes a baseline for comparison. If the capnograph malfunctioned, record that the reading was not reliable and state which alternative monitoring methods were used.

How do I explain a capnography abnormality to a client or a less experienced colleague?

Use concrete language that connects the waveform to what the patient is experiencing. For a client, explain that the monitor measures the carbon dioxide leaving the lungs, and that an abnormal pattern can indicate a breathing tube problem, a lung issue, or a change in breathing depth. Avoid alarming terms and focus on what is being done in response. For a colleague or student, describe the waveform feature you observed, name the most likely differentials, and state why you chose the next step. The MSD Veterinary Manual provides accessible descriptions of respiratory monitoring that can be adapted for client communication. Frame the discussion around the clinical question being answered, not the equipment, and invite the colleague to identify alternative interpretations.

When should I escalate a capnography abnormality to a specialist or referral center?

Escalate when the abnormality persists despite corrective action, when it is accompanied by hemodynamic instability, or when you cannot identify the cause. A rising EtCO₂ with a normal waveform may indicate hypoventilation that you can address by adjusting ventilation. A waveform that suggests rebreathing or circuit malfunction should resolve after circuit inspection. If the patient deteriorates, if oxygen saturation falls, or if the capnogram remains abnormal after troubleshooting, transfer to a facility with advanced monitoring and critical care capabilities. The WSAVA Global Pain Council guidelines note that timely referral improves outcomes when resources exceed local capacity. Document the sequence of events and the interventions attempted before transfer, and communicate these directly to the receiving clinician.

Related Clinical & Scientific Guides

• Anesthetic Machine Leak Testing and Pressure Checks: A Step-by-Step Protocol
• Anesthetic Depth Assessment: Reflexes, Eye Position, and Ventilation
• Anesthesia for Patients with Obesity: Challenges and Solutions

References and Further Reading

• Mouse Anesthesia: The Art and Science.. 2021.
• Anesthesia and physiological monitoring during in vivo imaging of laboratory rodents: considerations on experimental outcomes and animal welfare.. 2012.
• AAHA Anesthesia and Monitoring Guidelines for Dogs and Cats. AAHA.
• WSAVA Global Pain Council Guidelines. WSAVA.
• MSD Veterinary Manual, Professional Edition. MSD Veterinary Manual.
• American Veterinary Medical Association Practice Resources. American Veterinary Medical Association.
• WOAH Terrestrial Animal Health Code. WOAH.

Related Articles

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• Anesthesia for Patients with Cancer: Paraneoplastic Syndromes
• Anesthesia for Patients with Sepsis: Hemodynamic Support
• Anesthesia for Patients with Trauma: Emergency Considerations
• Anesthesia for Patients with Ear Hematoma: Surgical Repair

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.