Otitis in Dogs and Cats: Diagnosis, Treatment, and Outlook
Otitis externa is inflammation of the ear canal and may occur with or without infection. Treatment aims to relieve pain and inflammation, control microorganisms when appropriate, and investigate the underlying cause. Repeating ear drops whenever an odor returns can hide a process that is still progressing.
1. Symptoms and warning signs
Head shaking, scratching, redness, odor, discharge, and pain are common signs. A pet may avoid being touched or behave differently because of pain. Wax color alone cannot identify yeast, bacteria, or mites. A suddenly swollen ear flap may be a hematoma and needs examination. [1,2]
Persistent head tilt, loss of balance, involuntary eye movements, inability to blink, or severe pain call for urgent assessment because of possible deeper ear involvement or another neurologic disorder. Do not put cleaners or drops in the ear to try to resolve these signs. [3]
2. Differential diagnoses and contributing factors
| Group | Examples and relevance |
|---|---|
| Primary | Allergies, mites, foreign objects, or other diseases that initiate inflammation. |
| Predisposing | Moisture, anatomy, and obstructions that make problems more likely. |
| Secondary | Overgrowth of bacteria or yeast in an altered ear canal. |
| Perpetuating | Thickening, narrowing, mineralization, or middle-ear involvement. |
This framework can help investigate recurrent ear disease in dogs. A dog with repeated episodes may need evaluation for atopy or a food reaction, but not every case of otitis is allergy-related. [4]
In cats, mites, polyps, masses, and middle-ear disease are also considered. Chronic discharge from one ear should not be treated indefinitely as a simple infection. Age and presentation guide testing; percentages from referral hospitals do not describe all pets. [5,6]
3. Diagnosis: what each examination can show
The history includes duration, affected ear, bathing, previous treatment, allergies, and neurologic signs. Both ears and the skin are examined, including pain and damage.
Otoscopy looks for inflammation, obstruction, foreign objects, and changes to the eardrum. A closed, painful, or debris-filled canal may require initial pain control, professional cleaning, or sedation. Not being able to see the eardrum does not confirm that it is intact. [1]
Cytology examines a sample from each ear for cells, bacteria, or yeast, ideally before cleaning. Culture and susceptibility testing may be needed when rods, resistance, recurrence, or suspected middle-ear disease are present; they are not indicated or interpreted the same way in every case. Video otoscopy, imaging, or biopsy is selected according to the concern. [1,5]
4. Targeted treatment
Pain and inflammation
A veterinarian may recommend pain relief and anti-inflammatory treatment to keep the patient comfortable and allow treatment to reach the canal. A topical or systemic glucocorticoid is used in some cases; selection depends on lesions, concurrent disease, and follow-up. Do not give human pain medicines or force examination of a painful ear.
Treating infection and the underlying cause
| Finding | Possible management |
|---|---|
| Yeast associated with disease | Otic antifungal, appropriate cleaning, and inflammation control. |
| Bacterial infection | Antibacterial treatment guided by examination and cytology; culture when indicated. |
| Mites | An antiparasitic appropriate for the species and case; assess household pets when advised. |
| Foreign object or polyp | Professional procedure; drops alone will not resolve the obstruction. |
| Recurrent allergy | Control the flare and manage the underlying disease. |
| Middle-ear disease or irreversible changes | Further assessment, specific treatment, and possible referral or surgery. |
Topical therapy is often central to treating otitis externa; systemic treatment has specific indications. A culture result does not authorize choosing any antibiotic marked “susceptible” on your own: the eardrum, formulation, species, and safety matter. [1,4,5]
Cleaning and giving medication at home
Start only with the product and technique that were recommended. Prepare the cleaner, gauze, and medication; ask for a demonstration if needed.
- Apply the cleaner as directed, keeping the tip from touching the ear canal.
- If authorized and not painful, gently massage the base of the ear.
- Allow the pet to shake its head and use gauze to remove visible material from the ear flap.
- Apply medication in the instructed order and at the instructed interval; there is no universal waiting time for every combination.
- Stop handling the ear if there is severe pain, dizziness, or a concerning change, and contact the veterinary team.
Do not insert cotton swabs, tweezers, or other objects. Avoid alcohol, hydrogen peroxide, and homemade mixtures. Healthy ears do not all need frequent cleaning; over-cleaning can also irritate them. [7]
5. Follow-up and relapse prevention
Agree on a recheck at the first visit. Pain, appearance, otoscopy, and cytology when appropriate are assessed before ending or changing the plan. Duration depends on resolution and the product: do not stop just because the odor is gone or continue drops indefinitely.
Record which ear was treated, applications, discomfort, and water exposure. Recurrent otitis calls for a specific remission-maintenance plan, not repeated use of leftover antimicrobials. If treatment fails, reassess administration, obstruction, underlying disease, and the middle ear before repeating it. [4]
Ask for instructions about bathing and swimming during recovery. If the pet does not tolerate treatment, report the difficulty rather than using more force or skipping doses without agreement.
6. Outlook
Ear disease affecting the outer canal can often be controlled when treated promptly. Outlook is less favorable when the cause persists, structural changes develop, or the middle or inner ear is affected. Advanced disease may require surgery; recurrence does not always progress to that point. The goal is a comfortable, functional ear with prevention and follow-up tailored to the patient. [2,4]
Ask about a veterinary assessment. What can be examined at home depends on the case; neurologic signs or rapid deterioration require in-person emergency care.
References and limits of the evidence
- Merck Veterinary Manual: Otitis externa in animals, updated in 2026. Diagnosis and clinical management.
- VCA: Ear infections in dogs. Outlook and complications.
- VCA: Inner ear infection in dogs. Signs of deeper involvement.
- Nuttall T, 2023. Managing recurrent otitis externa in dogs. JAVMA. Correct DOI: 10.2460/javma.23.01.0002. Indexed abstract.
- Brame and Cain, 2021. Chronic otitis in cats. DOI: 10.1177/1098612X211007072. Indexed abstract.
- Retrospective series of 103 feline otitis cases, 2026. Referral hospital; it does not estimate population prevalence. Indexed abstract.
- VCA: Instructions for ear cleaning and medication. Care after veterinary advice.
Sources checked October 29, 2026. This educational guide supports an individual plan: medicines, doses, procedures, and follow-up should be directed by the responsible veterinarian.