Why Does My Dog Keep Getting Ear Infections?

If your dog has had more than two ear infections in a year, the infection is not the problem. It is a symptom. The real issue is almost always one of three things: allergies, ear canal anatomy, or chronic moisture. Until you address the root cause, the infections will keep coming back, the treatment costs will keep adding up, and your dog will keep suffering.

Allergies are the most common cause

Environmental allergies (atopic dermatitis) and food sensitivities cause inflammation in the ear canal. That inflamed tissue becomes a breeding ground for yeast and bacteria. Studies show that 50 to 80 percent of dogs with atopic dermatitis develop secondary ear infections. The ear infection is just where the allergy shows up first.

If your dog also licks their paws, has itchy skin, or gets seasonal flare-ups alongside the ear infections, allergies are almost certainly the driver. A veterinary dermatologist can run intradermal allergy testing to identify specific triggers. From there, immunotherapy (allergy shots or drops) can reduce flare-ups by 60 to 80 percent over time.

Anatomy plays a bigger role than most owners realize

Breeds with floppy ears, narrow ear canals, or excessive hair in the canal are predisposed to chronic infections. Cocker Spaniels, Basset Hounds, Labrador Retrievers, Golden Retrievers, and Poodles top the list. The floppy ear traps moisture and reduces airflow, creating a warm, damp environment where yeast and bacteria thrive.

For these breeds, preventive ear cleaning every 1 to 2 weeks with a veterinary-grade drying solution is not optional. It is baseline maintenance. Products containing ketoconazole or chlorhexidine work well for prevention. Avoid hydrogen peroxide or alcohol-based solutions, which can irritate already-sensitive tissue.

Moisture is the accelerant

Swimming, bathing, and humid climates all increase ear infection risk. Water gets trapped in the ear canal and creates the perfect environment for microbial growth. If your dog swims regularly, drying the ears immediately after every swim is critical. A drying ear solution applied after water exposure can reduce infection recurrence by over 50 percent.

When ear infections signal something bigger

Recurrent ear infections in dogs over 5 years old can also signal hypothyroidism or Cushing's disease. Both conditions suppress the immune system and make the ear canal more susceptible to infection. If your dog has chronic ear infections plus any combination of weight gain, lethargy, thin coat, or increased thirst, ask your vet to run a thyroid panel and consider an LDDS test.

Breaking the cycle

The most effective approach is to identify and treat the underlying cause while managing symptoms. That means allergy testing if allergies are suspected, preventive ear cleaning on a regular schedule, drying ears after water exposure, and asking your vet about long-term management rather than just treating each infection as it appears.

Cogua analyzes your dog's full health history, including ear infection patterns, and identifies what is driving the cycle. Upload your vet records and get a specific plan for breaking it.