Dog Ear Infections: Signs, Cleaning & When to See a Vet

Signs your dog may have an ear infection

Dogs can't tell you their ear hurts, so the clues are mostly physical. The classics are shaking the head, scratching at one ear, and tilting the head to the side. You might also notice redness inside the flap, a dark or yellowish discharge, and a smell that's tough to miss — often described as yeasty, sour, or like stale corn chips.

None of that is subtle once it's underway, which is part of the problem. Ear infections (otitis externa) are among the most common reasons dogs end up at the vet, with studies putting the condition in roughly 7–16% of dogs seen in primary care.^[1] The earlier you catch it, the cheaper and easier it is to treat.

Why dogs get them

The short version is moisture and anatomy. A dog's ear canal is shaped like an "L" — it goes down, then turns — so water, wax, and debris get trapped more easily than in our ears. Dogs that swim or get bathed often are at higher risk, and so are breeds with floppy, heavy ears or hair growing deep in the canal.^[2] Think Cocker Spaniels, Basset Hounds, Labs, and Goldens.

But the trigger matters more than the shape of the ear. Many "ear infections" are actually yeast or bacteria overgrowing on top of an allergy — food or environmental — that has made the ear canal inflamed and itchy in the first place.^[3] That's why an infection that keeps coming back is usually a clue to look deeper, not just to reach for more drops.

How to clean your dog's ears safely

• Use a vet-approved cleaner. Skip the DIY mixes — alcohol, vinegar, or olive oil can sting, dry out, or feed the wrong microbes. A pet-specific ear cleaner is formulated for a dog's ear.
• Fill, massage, let them shake. Squirt enough cleaner to fill the canal, massage the base of the ear for 20–30 seconds, then stand back and let your dog shake it out.
• Wipe the flap only. Use a cotton ball or soft cloth on the outer flap. Avoid cotton swabs — they push debris deeper and can damage the eardrum.
• Don't clean a painful ear. If the ear is red, swollen, or painful to touch, skip the cleaner and go straight to the vet. Cleaning an infected ear before a vet has checked the eardrum can do harm.

When to call the vet

Ear infections rarely clear on their own, and they hurt. Book a visit sooner rather than later if you see any of these: a head tilt or loss of balance, swelling around the ear, hearing loss, a bad smell that won't clear, or your dog yelping when the ear is touched. Those can mean the infection has moved deeper — into the middle or inner ear — and that's a different, more serious problem.^[2]

What treatment costs

Cost depends on how deep the infection has gone and whether it keeps coming back.^[4] Here's a rough breakdown of what to expect at the vet.

Treating the infection is one thing; finding why it started is another. When a dog gets repeat infections, the real fix is often managing the underlying allergy, which is why costs for "recurring" cases climb higher.^[3]

Preventing repeat infections

• Dry the ears after water. After a bath or swim, wipe the outer flap and let the ear breathe. A good cleaner after swimming helps for dogs prone to infection.
• Keep them groomed. For breeds with hair in the canal, regular plucking or trimming (ask your vet or groomer) reduces the trap for moisture.
• Treat the allergy, not just the ear. If infections keep coming back, talk to your vet about a food trial or allergy testing. Fixing the inflammation at the source beats a lifetime of drops.^[3]

FAQ

Can I treat my dog's ear infection at home?

Not safely, in most cases. Home remedies can rupture an eardrum or push infection deeper, and you can't tell from the outside whether the eardrum is intact. Let a vet look first, then follow their cleaning and medication plan at home.

How can I tell if it's an infection or just dirt?

Dirt doesn't usually smell sour or make your dog shake its head and scratch. Redness, discharge, an odor, and persistent head shaking all point to infection, not debris.

Why does my dog keep getting ear infections?

Recurring infections usually mean there's an underlying cause — most often an allergy. Until you address the allergy, the ear canal stays inflamed and keeps inviting yeast and bacteria back in.^[3]