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Ear infections are one of the most common reasons dogs visit the veterinarian. While an ear infection may seem like a simple problem, recurring or untreated ear infections can become painful and difficult to manage. Understanding what causes ear infections—and why they keep coming back—can help keep your dog's ears healthy.
What Causes Ear Infections in Dogs?
Dog ear infections can have several different causes. The most common underlying factors include:
- Allergies: Environmental allergies and food allergies are a very common cause of recurring ear infections.
- Yeast and bacteria: These organisms normally live on the skin in small numbers but can multiply when the ear canal becomes inflamed or moist.
- Moisture: Swimming, bathing, or frequent exposure to moisture can create an environment where yeast and bacteria thrive.
- Ear anatomy: Dogs with floppy ears, narrow ear canals, or excessive hair around the ears may be more prone to infections.
- Foreign material: Grass awns and other foreign objects can become lodged in the ear canal.
- Hormonal or skin conditions: Certain underlying diseases can make dogs more susceptible to recurrent infections.
Because there are so many possible causes, simply treating the infection without addressing the reason it developed can lead to repeated problems.
What Are the Signs of an Ear Infection?
Dogs with an ear infection may show one or more of the following signs:
- Scratching or rubbing at the ears
- Frequent head shaking
- Redness or swelling of the ear canal
- Bad odor coming from the ear
- Brown, yellow, or black discharge
- Sensitivity or pain when the ears are touched
- Holding the head tilted to one side
- Excessive licking of the paws or other signs of allergies
Some dogs have relatively mild symptoms despite having significant inflammation deeper in the ear canal.
Why Does My Dog Keep Getting Ear Infections?
If your dog has repeated ear infections, there is usually an underlying reason that needs to be addressed.
Allergies are one of the most common causes of recurrent ear infections. Dogs with allergies often develop inflammation in their skin and ear canals, which makes it easier for yeast and bacteria to overgrow.
Other possibilities include chronic skin disease, ear anatomy, hormonal disease, or an infection that was never completely resolved.
If your dog develops multiple ear infections each year, it's worth investigating why they are happening rather than simply treating each infection as it occurs.
How Are Ear Infections Diagnosed?
Your veterinarian will examine the ear canal with an otoscope to look for inflammation, discharge, foreign material, and abnormalities involving the eardrum.
We may also recommend ear cytology, which involves examining a sample of the ear discharge under a microscope. This allows us to determine whether yeast, bacteria, or inflammatory cells are present and helps guide appropriate treatment.
Cytology can be particularly important in dogs with recurrent infections or infections that aren't responding to their usual medication.
How Are Dog Ear Infections Treated?
Treatment depends on what is found during the examination.
Most infections are treated with medication applied directly into the ear. Depending on the severity and type of infection, your veterinarian may prescribe medication targeting yeast, bacteria, inflammation, or a combination of these.
Some dogs with severe or chronic infections may also need oral medications.
It is important to follow your veterinarian's treatment instructions carefully and complete the recommended course of treatment, even if your dog's ears seem better after a few days.
Can I Treat My Dog's Ear Infection at Home?
It's best to have your dog's ears examined before starting treatment.
Different types of ear infections require different medications, and using the wrong product can make the problem worse. Some ear medications are also unsafe if the eardrum is damaged.
Avoid using vinegar, hydrogen peroxide, alcohol, or other homemade ear remedies unless specifically recommended by your veterinarian.
If your dog has a history of ear infections, your veterinarian can also recommend an appropriate ear-cleaning routine and product for your dog's individual needs.
How Can I Prevent Ear Infections?
Prevention depends on the underlying cause. Some dogs benefit from routine ear cleaning, particularly after swimming or bathing. Others need better control of an underlying allergy or skin condition.
If your dog has allergies, controlling the allergy is often an important part of preventing future ear infections.
Your veterinarian can help determine how often your dog's ears should be cleaned and whether routine cleaning is appropriate. Over-cleaning can actually irritate the ear canal, so more cleaning isn't necessarily better.
When Should I See a Veterinarian?
Contact your veterinarian if your dog is showing signs of an ear infection, especially if you notice:
- Significant pain
- Severe swelling or redness
- A strong odor or large amount of discharge
- Persistent head shaking or scratching
- A head tilt or problems with balance
- Repeated ear infections
- An infection that isn't improving with treatment
The sooner an ear infection is treated, the easier it is to manage. Chronic ear infections can cause thickening and narrowing of the ear canal, making future infections more difficult to treat and potentially leading to permanent ear damage.
Healthy Ears Start With Finding the Cause
An ear infection is often a symptom of a bigger problem rather than the problem itself. If your dog keeps developing ear infections, your veterinarian can help determine whether allergies, skin disease, anatomy, or another underlying condition is contributing.
If your dog is scratching, shaking their head, or has an odor coming from their ears, schedule an appointment with your veterinarian for an examination. Early treatment can help prevent a painful ear problem from becoming a chronic one.
