Quick answer: how to tell if my dog has an ear infection
Common clues include repeated head shaking, ear scratching, bad smell from the ear, redness, and discomfort when the ear is touched. Some dogs also show dark discharge or seem less playful.
Dogs
How to Tell If My Dog Has an Ear Infection
Published 2026-04-27 • 11 min read
If your dog keeps shaking their head or scratching one ear, an ear infection may be starting. This guide helps you spot mild and advanced signs and know when vet care is needed.
Educational guide only. This article does not replace a veterinary exam, diagnosis, or emergency care.
Common Signs of Ear Infection in Dogs
Many dogs show behavior changes before owners see clear discharge. Watching routine habits can help you act sooner.
Checklist
- Frequent head shaking
- Pawing or rubbing one ear
- Tilting head to one side
- Pulling away when ear is touched
What Ear Discharge Means
Discharge color and smell can give useful clues, but color alone is not a diagnosis. Clear moisture may be mild irritation, while thick yellow, brown, or green discharge is more concerning.
A sour or strong odor with discharge and repeated scratching often suggests inflammation or infection that needs veterinary treatment.
Why ear infections happen
Ear infections often happen when the ear canal stays warm and moist, or when irritation from allergies or wax buildup is present.
Checklist
- Allergy-related inflammation
- Moisture after bathing or swimming
- Wax buildup and poor airflow
- Underlying skin conditions
Early vs Advanced Symptoms
Early signs include mild head shaking, occasional scratching, and light redness. Advanced signs include thick discharge, strong odor, severe pain, swelling, and balance changes.
If symptoms move from occasional to daily, treat the case as higher priority.
Real-world example: after-bath flare
A dog may seem normal after a bath, then start head shaking the next day. If moisture is trapped and irritation starts, symptoms can grow quickly over 24 to 48 hours.
Early cleaning with the wrong product can make irritation worse, so product choice matters.
What to do at home
Keep your dog calm and prevent heavy scratching when possible. Gently observe the outer ear, but avoid deep cleaning tools.
If signs stay mild, book a regular vet visit soon. If signs worsen quickly, move to urgent care.
Checklist
- Track symptoms by day with photos and notes
- Keep ears dry after outdoor play or bathing
- Use only vet-approved ear products
- Avoid adding multiple new treatments at once
What not to do
Home mistakes are common and can delay recovery or hide serious problems.
Checklist
- Do not use cotton swabs deep inside the ear canal
- Do not use human ear drops without veterinary advice
- Do not ignore bad smell plus pain signs
- Do not keep repeating random over-the-counter products
Practical checklist before a vet visit
Bring this checklist to make diagnosis faster and clearer.
Checklist
- Which ear is affected (left, right, or both)
- How often head shaking happens each day
- Whether odor or discharge is present
- Recent swimming, baths, or grooming events
- Current diet, allergy history, and skin symptoms
When to Call a Vet
Call your vet quickly for severe pain, swelling, bleeding, thick discharge, balance trouble, or sudden behavior decline. These signs may need fast treatment and should not be managed at home alone.
Key Takeaways
Early pattern recognition can prevent deeper ear problems.
Checklist
- Head shaking plus odor is a strong warning combo
- Use only pet-safe, vet-guided ear care
- Avoid deep ear cleaning tools at home
- Escalate quickly for pain, discharge, or balance changes
Frequently Asked Questions
Yes. Some dogs show early signs like scratching, odor, and head shaking before discharge is obvious. Behavior changes can appear first. If these signs persist, schedule a veterinary ear check. Early treatment is usually easier than late treatment.
A bad smell is a warning sign, but not a full diagnosis by itself. It may come from yeast overgrowth, bacteria, wax buildup, or inflammation. Your vet can identify the cause with an ear exam and sample testing. Avoid guessing treatment from odor alone.
Use caution. If the ear is painful, very red, or has discharge, home cleaning may irritate it more. Gentle outer-ear wiping can be okay, but deep cleaning should wait for veterinary advice. Correct product and technique matter.
Frequent shaking after cleaning may mean irritation is still active or product choice is not suitable. Stop repeated cleaning and monitor for worsening signs like pain or discharge. Contact your vet if symptoms continue. Persistent shaking deserves medical review.
Yes, allergies are a common background trigger for recurring ear problems in many dogs. If infections keep returning, your dog may need a broader skin and allergy plan. Treating only the ear each time may not solve the root issue.
Seek urgent care for severe pain, swelling, bleeding, head tilt with balance issues, or sudden distress. These signs may indicate deeper ear involvement. Fast treatment helps reduce complications and discomfort.
Yes. Moisture trapped in the ear canal can increase irritation and microbial growth in some dogs. Drying ears gently and using vet-approved prevention plans may reduce risk. If your dog is a frequent swimmer, discuss routine ear care with your vet.