Dog Ear Infection: Spotting the Signs and Treating the Real Cause

A dog ear infection, called otitis externa when it affects the outer ear canal, shows up as head shaking, scratching at the ear, redness, a bad smell, and brown or yellow discharge. It needs a vet because the medicine has to match what is actually growing in the ear, bacteria or yeast, and, just as importantly, whatever allowed them to grow in the first place. In adult dogs that trigger is very often an underlying allergy. Treating only the surface is the main reason so many ear infections keep coming back.

At our clinic we treat ears all year round, with a clear peak in the warm months, and the pattern is often the same: the ear improves with drops, looks fine for a few weeks, then flares again. If your dog's ears smell or look sore, call us during opening hours on +961 9 548 115.

How to Tell Your Dog Has an Ear Infection

Most owners notice the behavior before the ear itself. The most common signs are:

• Head shaking, or holding the head tilted to one side
• Scratching or pawing at the ear, or rubbing it along the floor
• Redness and swelling inside the ear flap or at the canal opening
• A noticeable odor, often yeasty or sour
• Brown, yellow, or black discharge instead of a small amount of light wax
• Pain: flinching, yelping, or turning away when the ear is touched

An infection can affect one ear or both. A single affected ear often points to something local, such as a grass seed or water trapped after a swim. When both ears flare at the same time, and especially when they flare repeatedly, we start thinking about a body-wide cause such as allergy.

Cats show a very similar picture, with one difference: in a cat ear infection, ear mites are a much more common trigger than in adult dogs, and they spread easily between pets that groom or sleep together. If one pet in the house has mites, all of them usually need checking.

Why a Dog Ear Infection Keeps Coming Back: The Real Cause

Here is the part most owners have never been told: the bacteria and yeast in an infected ear are usually the visible problem, not the root problem. A healthy ear canal defends itself well. When infection takes hold, something has almost always changed the environment inside the canal first.

In adult dogs, the most common underlying driver is allergy, environmental or food related. Allergic skin disease inflames the lining of the ear canal, and that inflamed lining is where infections start. According to VCA Animal Hospitals, allergies are involved in as many as 43 percent of ear infection cases. This is why recurrent ears and itchy skin so often arrive together, as our guide to dog skin allergies explains. In some dogs, a repeating ear infection is the only visible sign of the allergy.

Other causes and risk factors we see regularly:

• Moisture. Water trapped in the canal after swimming or bathing creates the warm, humid environment yeast and bacteria love. Summer swims are the peak season for ears in Lebanon.
• Ear anatomy. Floppy ears and hairy or narrow canals hold heat and moisture, so some breeds need more ear care than others.
• Foreign objects. Grass seeds and plant material can lodge deep in the canal, usually in one ear.
• Parasites. Ear mites, more common in puppies and in cats than in adult dogs.

In my experience, the dogs that end up with chronic, thickened, painful ears are rarely the ones whose owners did nothing. They are the ones treated with repeated short courses of drops that cleared the surface infection while the underlying allergy kept working underneath. My position is the same for ears as for skin: treat the cause of the disease rather than mask it. The Merck Veterinary Manual makes the same point: unless the underlying cause is identified and treated, the infection is very likely to return.

What Your Vet Will Do (and Why the Exam Matters)

The ear exam is not a formality. Each step changes the treatment.

We look inside the canal with an otoscope. This shows how inflamed the canal is, whether there is a foreign object, and how much debris is blocking the way. A very painful ear sometimes needs sedation to be examined properly, which is kinder than forcing it.

We often examine a sample of the discharge. Under the microscope, yeast and the different types of bacteria look different, and they are not treated with the same medicine. Guessing skips this step and often picks the wrong treatment.

We check the eardrum. Some ear medications and cleaners must not be used if the eardrum is damaged, because they can harm the middle ear and hearing. This single check is a major reason ear problems belong at the clinic, not in the medicine cabinet.

We clean the ear before medicating it. Wax and discharge form a barrier that blocks topical treatment from reaching the canal lining. A proper clean first is often the difference between a dog ear infection treatment that works and one that seems to fail.

A word on antibiotics for dog ear infection: they are a normal part of treatment when the exam shows a bacterial infection, and we prescribe them in the right form for the right duration. What does not work is reaching for leftover drops or human medication at home: the wrong product in the wrong ear can make things worse. Prescription ear medications are not listed in our online shop for exactly that reason. They are prescribed first: once we have examined your dog and prescribed the treatment, you can message us on WhatsApp at +961 76 423 505 to reorder it, and we deliver.

Cleaning and Caring for the Ears at Home

Home care supports the vet's plan, and done well it prevents many flare-ups. Done badly, it causes them.

A proper ear cleaner is a liquid designed to dissolve wax and dry the canal. You fill the canal, massage the base of the ear, let the dog shake, then wipe away what rises with cotton or gauze. Two rules matter most: never push cotton buds down into the canal, where they pack debris deeper and can injure the eardrum, and never use home remedies such as vinegar or hydrogen peroxide, which irritate an inflamed canal. A soft wipe like Trixie Ear Care Fingerlings gently cleans the parts of the ear you can see.

Dry the ears thoroughly after every bath and every swim. Trapped water is one of the most preventable causes of ear infections we see, and our bathing and grooming guide covers the full routine.

It also helps to know what each type of cleaning is for:

For maintenance cleaning, we stock Dr. Seidel Otikor Ear Cleaner and Beaphar Ear Cleaner, both suitable for dogs and cats, with delivery across Lebanon and Syria. Both sit in our Dog Health collection with the rest of our ear and skin care range. Not sure which one suits your pet? Message us on WhatsApp at +961 76 423 505.

Preventing the Next One

Prevention is where the real progress happens, because a dog that stops relapsing is a dog whose cause has been found.

• Manage the underlying condition. If allergy is driving the ears, they will not stay healthy until the allergy is managed, through diet, skin care, or medication chosen with your vet.
• Match the routine to the dog. A floppy-eared dog that swims needs cleaning and drying far more often than a prick-eared dog that stays dry. We will suggest a rhythm at the clinic.
• Take recurrence seriously. One ear infection is an event. A third one in the same year is a pattern, and a pattern means it is time to investigate diet and allergies properly, and to re-examine the canal for a foreign body that may have been missed, instead of treating each episode alone.

Questions Pet Owners Always Ask

How do I know if my dog has an ear infection or just dirty ears?

Healthy ears carry a small amount of light-colored wax with no strong smell and no discomfort. An infected ear smells bad, produces brown, yellow, or black discharge, looks red or swollen, and usually bothers the dog. If there is odor, pain, or heavy discharge, treat it as a possible dog ear infection and have it examined.

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

No, an active infection needs a vet first, because treatment depends on what is growing in the ear and on whether the eardrum is intact. Home remedies such as vinegar or peroxide irritate the canal, and leftover drops can be the wrong medicine entirely. Home care with a proper cleaner is for maintenance and prevention, after the infection is diagnosed and treated.

Why does my dog keep getting ear infections?

Recurrent ear infections almost always mean an underlying cause is still active. In adult dogs the most common one is allergy, environmental or food related, but sometimes the explanation is simpler: a foreign body, such as a grass seed, that was never found and removed from the ear canal, so the ear keeps reacting to it. Moisture from swimming, ear shape, and unfinished treatment courses also play a role. Finding and managing that cause, rather than repeating drops, is what breaks the cycle.

Are dog and cat ear infections treated the same way?

The approach is the same: examine the ear, identify the cause, clean, then treat. The common causes differ, though. Ear mites are a frequent trigger in cats and spread easily between pets, while in adult dogs allergy is the more common driver. Cats also need medication chosen specifically for them, so never use a dog product on a cat.

Does my dog need antibiotics for an ear infection?

Only if the exam shows a bacterial infection; yeast infections and ear mites need different treatment, which is why we check a sample before choosing. When antibiotics are needed, they are prescribed after the ear has been examined and cleaned, so the medication can actually reach the infection.

Sore Ears? Call Us Before They Become Chronic

If your dog's ears are red, smelly, or painful, call the clinic during opening hours on +961 9 548 115 and we will book the ear exam. For a dog in severe pain outside opening hours, our emergency line answers 24/7 on +961 3 517 831: call first and we will be ready to receive you at the clinic in Jbeil, Byblos.

For healthy ears between visits, you can order Dr. Seidel Otikor Ear Cleaner or Beaphar Ear Cleaner from our shop, with delivery across Lebanon and Syria.