If your dog or cat is shaking its head or scratching at its ears right now, here is the short version: check the ear gently, note what you see and smell, and call your veterinarian rather than reaching for a home remedy. The rest of this guide walks through exactly how to do that, what your vet will do next, and how to keep the problem from becoming a repeat visitor. Southdale Pet Hospital is a veterinary clinic in Edina that treats ear infections in dogs and cats and helps local families sort out the harder question of why the infections keep coming back.
Step 1: Look, Smell, and Listen to the Ear Before You Do Anything Else
Start with a 30-second at-home check rather than jumping straight to a cleaner or drop. Lift the ear flap and look at the skin inside for redness, swelling, or discharge that's brown, yellow, black, or waxy. Take a sniff. A healthy ear has almost no odor, while an infected one often smells sour, yeasty, or musty. Watch your pet's behavior too: head shaking, pawing at the ear, tilting the head, rubbing the ear along furniture, or flinching when the area is touched are all signals worth taking seriously.
If you notice a puffy, pillow-like swelling on the ear flap itself, that's likely a ruptured blood vessel from violent head shaking (an aural hematoma), and it needs veterinary attention on its own, separate from the underlying infection.
Step 2: Decide How Urgently You Need to Be Seen
Most ear issues warrant a same-week appointment, but some signs mean you should call immediately. Treat it as an emergency if you see a head tilt that won't straighten out, stumbling, circling, rapid eye flicking, one side of the face drooping, bleeding from the ear canal, a suddenly swollen ear flap, or a pet who's also feverish, lethargic, or refusing meals. These point toward infection reaching the middle or inner ear, which threatens balance and hearing and needs prompt care.
For everything else, that is, ordinary itching, odor, or mild discharge, plan on an exam within a day or two. Ear infections do not resolve on their own, and the longer one sits, the tougher it becomes to clear.
Step 3: Understand Why This Keeps Happening (The Anatomy Behind It)
The dog and cat ear canal bends sharply, running down from the head opening before turning inward toward the eardrum, roughly shaped like an L. That turn protects the eardrum but works against drainage, so water, wax, and debris pool in the lower stretch instead of running out. Once the skin lining that canal gets irritated, from moisture, allergies, or a foreign object, the yeast and bacteria that normally live there quietly multiply into a full infection. Left unaddressed, that infection can push past the eardrum into the middle ear, a more painful stage that can affect balance and hearing.
Step 4: Match the Cause to the Right Fix
Wet Ears From Swimming or Bathing
Dry the visible part of the ear with a cotton ball or soft towel within about 48 hours of any swim or bath. Dogs who swim in Minnesota lakes all summer, or get frequent baths without a thorough dry-down afterward, are some of the most frequent repeat patients we see in the region.
Allergies Driving Repeat Infections
If your pet has had three ear infections this year, the real fix isn't the next bottle of drops, it's identifying what's inflaming the skin in the first place. In dogs, allergies to pollens, dust mites, molds, or food ingredients are the leading reason ears keep flaring, and for some dogs the ears are the only place that allergy ever shows up. Minnesota's long pollen season, running from spring tree pollen through fall ragweed, plus indoor dust and mold during our months of closed windows, gives allergic ears plenty of triggers locally.
Floppy Ears or Narrow Canals
If your dog is a spaniel, retriever, or hound type with heavy, floppy ears, or has hair growing inside the canal, expect to be more diligent about drying and checking ears than owners of upright-eared breeds. Ear shape doesn't cause infection alone, but it stacks the odds against airflow.
Ear Mites, Especially in Young Cats
A dark, crumbly discharge that looks like coffee grounds usually means ear mites, tiny parasites that feed on wax and skin debris and cause intense itching. Kittens, young cats, and pets recently adopted from shelters are the most common carriers, and because mites spread easily between pets, every animal in the household should be checked once one is diagnosed.
Grass Awns or Debris Stuck in the Canal
Sudden, one-sided head shaking after a walk through tall grass or brush points toward a foreign object lodged in the canal, common in the wooded and grassy stretches around Edina and greater Minnesota during warmer months. This calls for veterinary removal promptly, not a home flush.
Step 5: Know What the Veterinary Exam Involves
Expect an otoscopic exam first, where your veterinarian uses a lighted cone-shaped tool to check the full canal for swelling, debris, foreign material, growths, and whether the eardrum is intact. That matters because certain ear medications are unsafe to use if the eardrum has ruptured. Mites are often spotted directly during this step, either moving in the canal or under a drop of mineral oil on a swab sample.
Next comes cytology: a swab of the discharge gets rolled onto a slide, stained, and viewed under a microscope right in the clinic. Within minutes, your vet can tell whether yeast, bacteria, or both are behind the flare-up, since each usually needs a different medication. If the ear is too swollen or painful to examine comfortably while your pet is awake, sedation may be recommended, purely for comfort and safety, so the canal can be cleaned and assessed without a stressful struggle.
Step 6: Follow Through on Treatment Completely
Treatment typically opens with a professional ear cleaning so medication can actually reach the canal wall instead of sitting on top of debris. From there, your vet prescribes a targeted product, drops, ointment, or a longer-acting treatment applied in-clinic, based on what the exam and cytology revealed. Mites require antiparasitic treatment, usually for every pet in the home, and if allergies are the underlying driver, managing that allergy becomes part of the plan too.
Two rules apply no matter which product is used: finish the entire course even after symptoms improve, and come back for the recheck appointment. Pets often feel better within days, long before the infection is actually gone, and stopping early lets the organisms rebound, sometimes harder to treat than the first round. Repeated half-treated infections scar and narrow the canal over time, and in severe chronic cases that narrowing can block medication from reaching the infection at all, leaving surgery as the only remaining option.
Step 7: Skip the Home Remedies
Avoid vinegar rinses, hydrogen peroxide, and rubbing alcohol, no matter what you read online. These sting badly on already inflamed skin and dry out tissue that needs to heal. If the eardrum happens to be ruptured, pouring any liquid into the ear risks pushing it into the middle ear and causing real damage, including hearing loss. Leftover medication from a past infection is another trap since a new infection may involve a completely different organism, and using the wrong product can half-treat it while breeding resistant bacteria.
Step 8: Build a Weekly Prevention Routine
Do a quick weekly ear check: lift the flap, look, and sniff. No smell means a healthy ear.
Dry ears thoroughly after swimming or bathing, ideally within 48 hours.
Never insert cotton swabs into the canal; they push debris deeper and can injure the eardrum.
Only clean ears as your vet advises; over-cleaning a healthy ear can trigger the very irritation you're trying to avoid.
Keep parasite prevention current year-round; many flea preventives also guard against ear mites.
If infections recur, treat it as a clue to investigate allergies rather than just repeating ear drops.
How This Differs for Cats
Cats develop ear infections less often than dogs, but the cause list shifts toward mites in kittens and young cats. An adult cat with a one-sided infection and no mites present deserves a closer look deep in the canal, since polyps or tumors can block drainage and drive infection from within. Cats also mask discomfort well, so watch for subtler cues: an ear held slightly flattened, a scruffy patch of fur from overgrooming, or new irritability when the head is touched.
Frequently Asked Questions
How fast should I get my dog seen after I notice ear scratching?
Book an appointment within a day or two of noticing scratching, odor, or discharge, since ear infections don't clear up without treatment and become harder to resolve the longer they're left alone.
Can Minnesota winters or dry indoor heat affect my pet's ears?
Yes, dry winter air combined with allergy flare-ups from indoor dust and mold can irritate ear canal skin just as much as summer humidity, so weekly checks are worth keeping up year-round.
Is it safe to clean my dog's ears every day to prevent infection?
No, daily cleaning of a healthy ear can irritate the canal lining and actually trigger the problem you're trying to prevent, so stick to the cleaning schedule your veterinarian recommends.
My cat's ear smells bad but I don't see mites. What's next?
Odor without visible mites still needs a veterinary look, since adult cats with one-sided infections sometimes have a growth or foreign material deeper in the canal that only an otoscopic exam can find.
What happens if I stop giving ear drops once my pet seems fine?
Stopping early is the most common reason infections come back, often worse, because the organisms are knocked down but not eliminated, so always finish the full course and return for the recheck.
If your dog or cat has been shaking, scratching, or smelling a little off around the ears, reach out to the Southdale Pet Hospital team in Edina to schedule an exam. Along with ear cytology and otoscopic evaluation, Southdale Pet Hospital also offers allergy management support, so we can help you address not just this infection but whatever keeps setting your pet's ears up to fail.
Book an Appointment or call us at (952) 926-1831.