Why Does My Dog Keep Getting Ear Infections?
Ear infections are among the most common reasons dogs visit the veterinarian. Some dogs experience a single episode that resolves with treatment, while others develop infections repeatedly, sometimes only weeks or months apart.
Although ear infections are often treated with medicated ear drops, recurring infections can indicate an underlying problem that has not been fully addressed. At Lonsdale Place Veterinary Clinic, we encourage owners to understand why ear infections develop and why identifying the cause is essential for long-term management.
North Vancouver Vet
What Causes Ear Infections in Dogs?
The external ear canal is lined with skin and naturally contains small populations of microorganisms, including bacteria and yeast.
Under normal circumstances, the ear maintains a healthy balance. However, inflammation can disrupt the skin barrier and alter the environment inside the ear canal.
When this happens, bacteria or yeast may multiply excessively, resulting in an infection.
Several factors can contribute to this process.
Allergies: Environmental and food allergies are important underlying causes of recurrent ear inflammation. In some dogs, ear problems may be the only obvious sign of allergic disease.
Ear anatomy: Dogs with narrow ear canals, excessive hair within the canal, or certain anatomical features may be more susceptible to ear problems.
Moisture: Swimming or bathing can sometimes contribute to irritation by increasing moisture within an already inflamed ear canal.
Foreign material: Grass seeds and other foreign bodies can cause sudden irritation, especially when only one ear is affected.
Other medical conditions: Parasites, hormonal disorders, growths, and abnormalities affecting the skin can also contribute to ear disease.
North Vancouver Vet
How Can You Tell if Your Dog Has an Ear Infection?
Common signs include:
Frequent head shaking
Scratching or rubbing the ears
Redness or swelling inside the ear
Unpleasant odour
Brown, yellow, or other abnormal discharge
Pain when the ears are touched
Holding the head to one side
Some dogs become unusually sensitive around the head or resist having their ears handled.
Severe infections may cause significant swelling, ulceration, or involvement of deeper ear structures.
A persistent head tilt, loss of balance, or abnormal eye movements should be evaluated promptly because these signs can indicate middle or inner ear involvement.
North Vancouver Vet
Why Does My Dog's Ear Infection Keep Coming Back?
One of the most common reasons for recurrent ear infections is an untreated underlying condition.
For example, a dog with environmental allergies may repeatedly develop ear inflammation. Medication can eliminate the secondary yeast or bacterial infection, but if the allergic inflammation continues, the infection may return.
Another possibility is that the infection never completely resolved.
Certain bacteria may be difficult to eliminate, and chronic inflammation can cause the ear canal to thicken, making treatment more challenging.
This is why treating every episode with the same medication without reassessing the ear is not always effective.
North Vancouver Vet
How Are Ear Infections Diagnosed?
A veterinarian will usually examine the ears using an otoscope, which allows visualization of the ear canal and, when possible, the eardrum.
An important diagnostic test is ear cytology.
During cytology, a small sample of ear debris is collected and examined under a microscope.
This helps identify whether yeast, bacteria, or inflammatory cells are present and guides appropriate treatment.
In persistent or complicated cases, bacterial culture and susceptibility testing may be recommended.
Further investigation may also be necessary to identify allergies, foreign material, or other underlying causes.
North Vancouver Vet
How Are Ear Infections Treated?
Treatment depends on the findings of the examination and diagnostic testing.
Many uncomplicated external ear infections respond to appropriately selected topical medication.
The medication may contain an antimicrobial ingredient, an anti-inflammatory medication, or a combination of treatments.
Some dogs also require careful ear cleaning to remove accumulated debris.
However, excessive or inappropriate cleaning can worsen irritation, and not every ear-cleaning solution is safe when the eardrum is damaged.
Owners should avoid using leftover ear medications or home remedies without veterinary guidance.
Follow-up examinations are sometimes needed to confirm that the infection and inflammation have resolved.
North Vancouver Vet
Can Ear Infections Be Prevented?
Prevention focuses on identifying and managing the factors that trigger inflammation.
Dogs with allergic disease may benefit from a long-term allergy management plan. Some dogs require routine ear care, while others do not.
For dogs that swim frequently, keeping the ears appropriately dry may help, although excessive cleaning should be avoided.
North Vancouver Vet
Final Thoughts
Repeated ear infections are not simply a matter of having dirty ears. They often indicate an underlying problem such as allergies, chronic inflammation, or changes within the ear canal.
If your dog experiences frequent head shaking, scratching, ear odour, or recurring infections, contact Lonsdale Place Veterinary Clinic. Identifying the underlying cause can help reduce discomfort, prevent complications, and improve long-term ear health.
