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Ear Infections in Dogs — When to See a Vet: Causes, Warning Signs and Urgent Care

Ear Infections in Dogs (otitis externa or ear-canal inflammation) can range from local irritation to painful infection or disease involving deeper ear structures.

Call now for Same-Day Urgent & Emergency Care

Definition

Otitis externa is inflammation of the outer ear canal, often accompanied by yeast or bacterial overgrowth. Infection is not always the original trigger: allergy, trapped material, parasites, and ear-canal changes may also matter. The signs described here are clinical observations; they cannot establish this diagnosis without veterinary assessment.

This page focuses on dogs. The condition can also occur in cats, but likely causes, test interpretation, and care decisions vary by species; similar signs do not establish the same diagnosis.

For pet owners in Stittsville, Kanata, and nearby Ottawa communities, urgent-care assessment starts with the same clinical question used more widely: which findings explain the change, and how quickly does this pet need care?

Illustrative observation photo; it does not show a confirmed diagnosis. Photo: Dog scratching.jpg by Gannu03 — CC BY-SA 4.0. Unmodified.

Dog scratching beside its head while sitting on grass; scratching alone does not identify the cause.

Who This Page Is For

Head shaking, scratching, or rubbing an ear
Odour, redness, or ear discharge
Pain when the ear is touched or reluctance to chew
A return or progression of these changes after an earlier veterinary assessment

Who This Page Is Not For

An occasional head shake with no smell, discharge, redness, pain, or recurrence; repeated shaking belongs in an assessment.

If you are unsure whether this is significant, that uncertainty itself warrants veterinary assessment.

Related Urgent Symptoms

What This Can Look Like at Home

Clinical presentation often involves changes in everyday behaviour rather than an obvious diagnosis. Owners may notice:

Head shaking, scratching, or rubbing an ear
Odour, redness, or ear discharge
Pain when the ear is touched or reluctance to chew

Why This Can Be Hard to Judge

The colour or smell of discharge does not reliably select the right medication. Repeated infections warrant a search for contributing causes rather than simply reusing the last prescription.

Early misleading normalcy means that an apparently ordinary meal, walk, or quiet period can coexist with a developing problem. The trend, the combination of signs, and the examination matter more than one reassuring moment.

Differential diagnosis requires matching the history and physical findings with appropriate tests; an online description or photograph cannot do that reliably.

The Improvement Trap

Temporary improvement does not equal resolution.

Less scratching after a few doses does not necessarily mean the canal has recovered. Follow the prescribed course and recheck advice rather than stopping or extending treatment on your own.

A quieter interval is useful information for the veterinarian, but worsening pain, reduced appetite, or any red flag overrides an earlier period of improvement. Keep the advised recheck even if the visible signs settle.

What Is Easy to Miss at Home

A grass awn or other material inside one ear
An eardrum problem affecting medication choices
An underlying allergy contributing to recurrence
Discomfort when chewing or opening the mouth
A head tilt or an unusual loss of balance

These clues help a veterinarian judge the whole pet and choose the next step; none confirms or excludes a diagnosis on its own.

When This Can Be an Emergency

Triage evaluation is critical when the main sign occurs with pain, loss of normal function, or whole-body illness. Use the highest-priority category that applies:

Now — inability to stand, repeated falling, severe disorientation, collapse, or major ear/head trauma. Seek immediate assessment; if SKVH cannot receive your pet promptly, contact an open emergency hospital.
Today — head tilt, balance change, marked pain, a swollen ear flap, or discharge with reduced appetite or lethargy.
Appointment or monitoring limit — persistent smell, scratching, or head shaking: call within 24 hours for an appointment, sooner if worsening or painful.
Escalating signs — a problem that becomes more frequent, painful, or disruptive after seeming mild needs earlier advice rather than waiting for the original appointment.
Compounding signs — loss of appetite, repeated vomiting, or unusual weakness alongside the main change raises the priority; call the same day.
Systemic red flags — breathing difficulty, collapse, very pale gums, or inability to respond normally require immediate assessment, whatever the suspected cause.

How Veterinarians Assess This

Clinical signs alone cannot reliably determine severity.

Symptoms can appear similar while representing very different internal disease processes. Diagnostic testing is how veterinarians determine whether a condition is mild and self-limiting or serious and potentially life-threatening, and how they guide appropriate care.

Additional disease-specific testing (such as CT imaging or biopsy when deeper disease or a growth is suspected) may be considered based on the overall clinical picture.

The links above lead to the hospital’s diagnostics overview. The veterinarian selects tests after examination; availability, anaesthesia needs, and referral are discussed where relevant. Not every pet needs every test.

Veterinary Differentials - Serious / Must-Rule-Out First

These are not diagnoses. Diagnostic testing determines which conditions apply.

The following are possibilities when the examination and accompanying signs support them. They are not equally likely in every pet, and systemic causes are considered when there are systemic findings.

Otitis media: inflammation or infection of the middle ear.
Tests may include Otoscopy, Ear cytology, CT imaging.

Otitis interna: disease affecting the inner ear and balance system.
Tests may include Neurologic examination, CT imaging.

Ear-canal neoplasia: a growth within the ear canal.
Tests may include Otoscopy, Biopsy.

Ear-canal foreign material: an object trapped in the ear canal.
Tests may include Otoscopy, Ear cytology.

Severe ear-canal narrowing: thickening or scarring that limits canal access and drainage.
Tests may include Otoscopy, CT imaging.

Veterinary Differentials - Common / More Typical

These include more typical explanations and other alternatives for overlapping signs. Age, sex, reproductive status, species, and examination findings determine relevance; inclusion does not mean each is common in every patient.

Malassezia-associated otitis: yeast overgrowth contributing to ear inflammation.
Tests may include Ear cytology, Otoscopy.

Bacterial otitis externa: bacterial overgrowth contributing to outer-ear inflammation.
Tests may include Ear cytology, Otoscopy.

Ear mites: parasites that can irritate the ear canal.
Tests may include Microscopic mite examination, Otoscopy.

Environmental allergy-associated otitis: ear inflammation linked to environmental allergens.
Tests may include Ear cytology, Skin scraping.

Contact-reaction otitis: ear inflammation associated with contact irritation or allergy.
Tests may include Ear cytology, Otoscopy.

Safety, Psychology, & Peace of Mind

Uncertainty is a reason to ask for triage, not a requirement to identify the disease yourself. A short account of what changed and when helps the clinical team decide how soon the pet should be seen.

A normal-looking interval can make timing difficult. Use the red flags and the assessment timeframe above, and call sooner if pain, appetite, activity, urine output, or breathing worsens.

Prognosis depends heavily on the underlying cause, severity, and examination findings. Assessment can narrow that uncertainty without assuming every pet has the most serious possibility.

Ask the veterinarian which tests answer the immediate question, what can be staged, and what follow-up is needed. Care options, practical constraints, and referral can be discussed after the pet’s needs are assessed.

Same-Day Urgent Care at Stittsville Kanata Vet Hospital — call option 1

Call for Bookings & Non-Urgent Questions — option 2

Text Us: 343-463-8787 for routine questions and bookings

For immediate red flags, call rather than waiting for a text reply. If SKVH is closed or cannot assess your pet promptly, contact an open emergency hospital.

Frequently Asked Questions

When should ear infections in dogs be assessed urgently?

For ear infections in dogs, seek same-day assessment for head tilt, balance change, marked pain, a swollen ear flap, or discharge with reduced appetite or lethargy. Immediate red flags include inability to stand, repeated falling, severe disorientation, collapse, or major ear/head trauma. Call for triage using the highest-priority category above.

Can a pet seem well despite ear infections in dogs?

Signs associated with ear infections in dogs can be intermittent or subtle, so a normal-looking interval does not rule out a problem. The colour or smell of discharge does not reliably select the right medication. Arrange assessment for persistent or recurring changes, sooner for the red flags above.

Does improvement rule out ear infections in dogs?

Improvement in signs associated with ear infections in dogs does not establish that the underlying problem has resolved. Less scratching after a few doses does not necessarily mean the canal has recovered. Keep the advised assessment or recheck, and call sooner if signs return or worsen.

Why are tests considered for ear infections in dogs?

Assessing ear infections in dogs requires more than outward signs alone. Veterinarians may consider otoscopy, ear cytology or ear culture, depending on the examination. Ask which tests are needed for your pet and how the results will guide the next step.

What should I do next about ear infections in dogs?

For possible ear infections in dogs, the next step is veterinary triage based on current signs and the timing above. Call SKVH on option 1 for urgent concerns or option 2 for a stable booking question. For immediate red flags, seek an open receiving facility promptly rather than waiting for a message reply.