Skip to main content

Itchy, Smelly Ears? A Practical Guide to Dog and Cat Ear Infections

Ear infections are one of the top reasons pets end up on the exam table, and the reason is simple: the ear canal is a warm, dark, curved tunnel that holds onto moisture far better than it releases it. Infections can flare up in any season, but stretches of humidity, water left behind after a swim or a bath, and seasonal allergens can all shift the conditions inside that canal in favor of trouble.

The tricky part is that those changes tend to build slowly. By the time a pet is shaking their head across the living room, the problem has usually been brewing for a while. That is why catching the early signs is one of the most valuable skills a pet owner can develop.

Some pets are simply more prone to ear problems because of their anatomy, their allergies, or their overall health. Even so, knowing what to watch for and following an ear-care routine suited to your individual pet can go a long way toward breaking the cycle of repeat infections.

What actually causes ear infections in dogs and cats?

Most ear infections begin when something disrupts the normal balance inside the canal, whether that is inflammation, trapped moisture, or an underlying condition. Once that balance tips, the yeast and bacteria that normally live there in small numbers start multiplying, and an infection follows.

A few common culprits:

Moisture

Water that lingers after swimming or bathing turns the ear canal into a warm, damp incubator. Yeast and bacteria find that environment very agreeable.

Allergies

Food and environmental allergies can inflame the lining of the ear canal. For many dogs, allergies are the hidden engine behind infections that keep coming back no matter how many times they are treated.

Ear shape and breed

Anatomy matters. Floppy ears act like a lid, and narrow or hairy canals hold heat and humidity instead of letting them escape. Cocker Spaniels, Basset Hounds, Poodles, and many doodle breeds are frequent visitors to the ear-infection club for exactly this reason.

Ear mites

More common in cats and in young animals, ear mites cause intense itching and a distinctive dark, crumbly discharge. They also travel easily between pets living in close quarters, so one itchy kitten often means checking the whole household.

Foreign material

Grass seeds, bits of plant debris, dirt, or a heavy buildup of wax can irritate or block the canal and set the stage for infection. If you suspect something is lodged in your pet’s ear, leave the removal to a veterinary professional. Attempting it at home risks pushing the object deeper.

Why some stretches of the year are riskier

Depending on the local climate and your pet’s particular triggers, seasonal allergens can stay active well into late summer and fall. Here in the Lowcountry, that overlaps neatly with months of swimming, humidity, and frequent baths, which gives ear infections plenty of opportunity.

That said, ears do not follow a calendar. Pets with allergies or a history of recurring infections can develop problems in any month. What matters far more than the season is what is happening inside the canal itself.

Signs your pet may have an ear infection

Ear infections hurt, but the clues are not always dramatic. Keep an eye out for:

  • Head shaking or a persistent head tilt

  • Scratching or pawing at the ear

  • A strong, sour, or yeasty odor

  • Redness or swelling at the ear opening or inside the flap

  • Brown, yellow, or black discharge

  • Rubbing the head along furniture, carpet, or the floor

  • Flinching or pulling away when the ear is touched

Cats tend to be more subtle about it. You might notice head shaking, scratching, one ear held at an odd angle, or dark debris in the canal. Reach out to our team at Brighton Veterinary Hospital if you spot any of these changes, especially when only one ear is involved or your pet reacts painfully to being touched there.

Safe at-home ear care, and what to skip

There is no single ear routine that fits every pet. Some do well with regular cleaning. Others have perfectly healthy ears that are best left alone unless a specific recommendation has been made.

Do:

  • Dry your pet’s ears thoroughly after swimming or bathing.

  • Use a veterinary-approved cleaner according to the directions, and wipe only the part of the ear you can actually see.

  • Give ears a weekly once-over for redness, odor, or debris, particularly in floppy-eared breeds and pets with a history of infections.

Avoid:

  • Pushing cotton swabs into the canal. They pack debris deeper and can injure the eardrum.

  • Home remedies and any product that has not been specifically recommended for your pet. Some can damage the ear canal or cause harm when used on an active infection. When you are unsure, let a professional handle it.

  • Leftover medication from a past infection or from another pet in the house. The wrong treatment can make a bad ear considerably worse.

If the ear is already red, swollen, painful, or draining, call before you clean. Cleaning will not cure an active infection, and working on a sore ear can cause real harm.

When to schedule an appointment

Ears deserve prompt attention, because infections are painful and rarely improve on their own. Book a visit if you notice redness, odor, discharge, ongoing scratching, head shaking, or tenderness around the ear.

During the exam, our team looks deep into the canal to confirm whether the eardrum is intact, and we typically examine a sample of ear debris under the microscope. That step is not a formality. Yeast, bacteria, and mites each call for different treatment, and the only way to choose correctly is to see what is actually there.

Left alone, an infection can travel deeper into the canal and become a chronic problem. Relentless head shaking and scratching can also rupture blood vessels in the ear flap, creating an aural hematoma, a painful pocket of blood that needs its own separate treatment. Getting ahead of the problem spares your pet discomfort and reduces the odds of complications.

How to help prevent ear infections

Not every infection is preventable, but thoughtful care and control of underlying conditions can meaningfully cut the risk of repeats.

  • Dry the ears completely after every swim or bath.

  • Clean on the schedule recommended for your pet, and no more than that. Over-cleaning irritates the canal and can create the very problem you are trying to avoid.

  • Stay ahead of allergies, since they are the most common root cause in dogs.

  • Keep up with routine wellness visits so subtle changes get caught early.

  • Ask whether your pet’s breed, lifestyle, or medical history calls for a customized ear-care plan, especially if your dog has floppy or hairy ears.

Regular, unhurried attention to your pet’s ears is what allows you to spot a small change before it becomes a miserable one.

If you are in or around Summerville, SC, the team at Brighton Veterinary Hospital can examine your pet’s ears, pinpoint what is driving a recurring infection, and build a prevention plan around their individual risk factors.

Frequently asked questions

Why does my dog keep shaking their head?

Persistent head shaking is one of the classic signs of ear irritation or infection. It can also point to ear mites, allergies, trapped water, or a foreign object. An occasional shake is normal, but forceful or repeated head shaking, particularly alongside odor, discharge, redness, or pain, should be evaluated.

How can I help prevent ear infections in my dog?

Dry the ears after swimming and bathing, clean them only as often as your care team advises, get any underlying allergies under control, and check floppy or hairy ears weekly for early redness or debris.

What are the signs of an ear infection in cats?

Cats may shake their heads, scratch at their ears, carry one ear differently, or develop dark, crumbly debris in the canal. Because cats are experts at masking discomfort, any change in ear behavior is worth mentioning at your next visit.

Can I clean my dog’s ears at home?

Yes, using a veterinary-approved cleaner and staying on the visible portion of the ear. Skip the cotton swabs and anything not recommended for your pet. Do not clean an ear that is already red, painful, or discharging. Call Brighton Veterinary Hospital instead.

Is a dog ear infection an emergency?

Most are not, but they are painful and will not clear up without treatment. Sudden severe pain, a swollen ear flap, or loss of balance should be assessed as soon as possible.