By: Teleah Grand DVM, CVA, CVFT, CVCH, CVTP

If your dog’s ears smell like corn chips and bad decisions, or your cat is shaking their head like they’re trying to reset their operating system, you’re not alone.

Ear infections are one of the most common reasons pets visit the veterinarian — and one of the most frustrating problems for pet owners.

Why?

Because many pets don’t just get one ear infection.
They get them over… and over… and over again.

Let’s talk about why that happens… And, more importantly, how to stop the cycle instead of treating the same problem five times.

Ear infections are usually not the real problem

Here’s the most important thing to understand:

Ear infections are usually a symptom, not the root cause.

In dogs

Most chronic ear infections are secondary to allergies, especially environmental allergies.

In cats

Recurring ear infections are less common, but when they occur in adult cats they are often linked to food allergies and inflammation.

The infection is the fire.
The allergy and inflammation are the gasoline.

If we only treat the infection but never address the inflammation underneath, the infection will keep coming back.

Let’s clear up two very common myths

Myth #1: “It’s probably mites”

In adult dogs and cats, ear mites are almost never the cause of chronic ear infections.

Yes… kittens and puppies can have mites.
Yes… newly rescued young pets may have mites.

But adult pets with recurring ear infections?
It’s almost never mites.

Treating repeatedly for mites in an adult pet with chronic ear infections usually just delays proper treatment and wastes money.

Myth #2: “Water in the ears caused it”

This one comes up constantly.

Dogs and cats can shake their heads with incredible force… essentially acting like little biological centrifuges. Water does not simply sit in the ear canal waiting to cause an infection.

“Swimmer’s ear” is primarily a human problem, not a dog or cat problem.

Ear infections happen because of inflammation inside the ear canal, not because of bath water or swimming.

What actually causes ear infections?

There are three main organisms involved in most ear infections:

  • Yeast – Malassezia
  • Staphylococcus bacteria
  • Pseudomonas bacteria

Sometimes it’s one.
Sometimes it’s two.
Sometimes it’s all three at once.

And, no, you cannot tell which one it is by looking, smelling, or guessing.

That’s why proper diagnosis matters.

Step one: We must look inside the ear (cytology)

To treat ears properly, we perform an ear cytology.

This means:

  • taking a swab from each ear
  • staining it
  • examining it under the microscope

This tells us:

  • what organisms are present
  • how severe the infection is
  • whether both ears are the same (they often are not)
  • and which medications will actually work

Without cytology, treatment becomes guesswork… and guesswork is expensive and often ineffective.

Pseudomonas: the most difficult ear infection

One of the more challenging bacteria we see is pseudomonas.

I often call pseudomonas:

the Transformer of the bacteria world

Because most ear medications:

  • sit in the ear briefly
  • then get absorbed

When most bacteria encounter the correct antibiotic, it kills them.  That’s the goal. That’s what we expect.

Pseudomonas?

Pseudomonas studies the antibiotic like a training manual.

Instead of simply dying off, it can start plotting world domination and use that antibiotic exposure like a booster rocket to become more resistant and more difficult to eliminate.

That’s why when pseudomonas is present, treatment has to be very specific, aggressive, and carefully monitored… not guesswork and not random over-the-counter products.

Inflammation is why infections keep returning

Yeast and bacteria love:

  • warm environments
  • moisture
  • darkness
  • inflammation

An inflamed ear canal becomes the perfect environment for organisms to thrive.

So even if we temporarily clear the infection, if we don’t address the underlying inflammation (often allergy-driven), the infection will return.

That’s why long-term management often involves:

  • allergy control
  • diet evaluation (especially in cats)
  • ongoing ear maintenance
  • and monitoring

Please stop putting these things into infected ears

This section is important.  Because many well-meaning home treatments can actually make ear infections worse.

No oils. Ever.

If you have a warm, moist, inflamed ear growing yeast or bacteria, adding oil only feeds the problem.

And just to be clear: this applies to all oils. Coconut oil, olive oil, essential oils—no oils ever belong in ears.

Oil can worsen infections and delay real treatment.

No apple cider vinegar

Apple cider vinegar is acidic and irritating.

In an already inflamed ear canal it can:

  • sting and cause significant discomfort
  • worsen inflammation
  • damage delicate tissue
  • make pets fearful of ear handling

Once ear care becomes painful, everything about treatment becomes harder.

Please skip the vinegar.

No hydrogen peroxide

Hydrogen peroxide bubbles, which makes it look effective.

Chemically, it breaks down into:

  • water
  • oxygen

It does not treat yeast or bacteria effectively and can irritate already inflamed tissue.

It may look productive… but it isn’t.

No alcohol

Alcohol in an inflamed ear canal hurts.

It increases irritation and makes pets resistant to future treatment.
If it would hurt in your own ear, it will hurt in theirs.

Be cautious with over-the-counter ear cleaners

Many pet store ear cleaners:

  • do not treat infection
  • do not control inflammation
  • may temporarily improve odor but not the underlying problem

Cleaning alone does not cure an infection.

What is appropriate?

There are veterinary ear flushes that are:

  • drying
  • gently acidifying
  • formulated specifically for ears
  • non-irritating
  • safe for inflamed tissue

These are designed to:

  • support treatment
  • help change the ear environment
  • and prevent recurrence when used appropriately

They are very different from vinegar, alcohol, peroxide, or oils.

The three-step plan to actually fix chronic ear infections

  1. Identify what’s present: Ear cytology tells us exactly what we are treating.
  2. Treat appropriately: Correct medication for the organisms present, plus inflammation control.
  3. Recheck to confirm it’s gone: Rechecks matter.

Infections can:

  • change organisms
  • become mixed
  • partially improve but not resolve

Without confirming resolution, infections often return quickly.

Rechecks are not an “extra.”
They are how we finish the job correctly and avoid repeated visits and expenses.

The real goal

The goal is not to temporarily make ears look better.

The goal is to:

  • identify the cause
  • treat correctly
  • confirm resolution
  • manage underlying inflammation
  • and prevent recurrence

Because no one wants to keep paying for the same ear infection over and over again.

Chronic ear infections are treatable… when we address the real problem and not just the surface symptoms.