Dog Ear Infections: Symptoms, Causes, and Treatment Options

If your dog has been shaking their head, scratching at their ears, or you’ve noticed an unpleasant smell when you get close, there’s a good chance you’re dealing with an ear infection. Ear infections are one of the most common reasons dogs visit the vet, and while they’re rarely an emergency, they’re uncomfortable for your dog and tend to get worse without treatment.

Here’s how to recognize an ear infection, what typically causes them, and how they’re treated.

Key Takeaways

• Head shaking, scratching, odor, and discharge are the most common signs of a dog ear infection.
• Floppy-eared breeds and dogs that swim frequently are at higher risk due to trapped moisture.
• Ear infections need veterinary diagnosis, since treatment depends on whether the cause is bacterial, yeast, or parasitic.
• Recurring infections often point to an underlying issue, such as allergies, that needs to be addressed separately.

Signs of an Ear Infection in Dogs

• Frequent head shaking or tilting
• Scratching or pawing at the ear
• A strong, unpleasant odor coming from the ear
• Redness or swelling inside the ear flap or canal
• Dark, yellow, or waxy discharge
• Rubbing the ear against furniture or the floor
• Sensitivity or pain when the ear is touched
• Loss of balance or unusual eye movements in severe, inner-ear cases

What Causes Ear Infections in Dogs

Trapped Moisture

Water left in the ear canal after swimming or bathing creates a warm, damp environment where yeast and bacteria thrive. This is why swimming breeds and dogs that bathe frequently are more prone to recurring infections.

Floppy Ears and Poor Airflow

Breeds with heavy, floppy ears, such as Cocker Spaniels, Basset Hounds, and Bassett-type breeds, have reduced airflow to the ear canal, which increases the risk of moisture buildup and infection.

Allergies

Environmental and food allergies are one of the most common underlying causes of chronic or recurring ear infections. Allergic inflammation changes the environment inside the ear canal, making it easier for yeast and bacteria to overgrow.

Ear Mites

More common in puppies and dogs exposed to other infested animals, ear mites cause intense itching and a distinctive dark, coffee-ground-like discharge. They’re contagious between pets, though not to humans.

Excess Hair or Wax Buildup

Some breeds grow hair inside the ear canal, which can trap wax and debris, creating conditions for infection if not managed with regular grooming.

Foreign Objects

Grass seeds, debris, or other foreign material can become lodged in the ear canal, especially in dogs that spend time outdoors in tall grass, leading to irritation and secondary infection.

Bacterial vs. Yeast Infections

Ear infections in dogs are generally bacterial, yeast-related (fungal), or a combination of both, and they can look and smell different:

• Yeast infections often produce a musty, sometimes sweet-smelling odor with brown or yellow, waxy discharge.
• Bacterial infections tend to produce a stronger, more unpleasant odor with yellow, green, or bloody discharge, and are more likely to cause visible pain and swelling.

Because treatment differs (antifungal versus antibiotic medication, or often a combination), a veterinarian will typically examine the ear with an otoscope and may take a sample to view under a microscope to confirm which type of infection is present before prescribing treatment.

How Ear Infections Are Treated

1. Veterinary examination to check the eardrum’s integrity (important, since some medications aren’t safe to use if the eardrum is ruptured) and identify the type of infection.
2. Ear cleaning, often performed by the vet during the visit and continued at home with a vet-recommended cleaner.
3. Prescription medication, typically ear drops containing antibiotics, antifungals, or a combination, along with an anti-inflammatory to reduce swelling and discomfort.
4. Follow-up visit, especially for more severe or chronic infections, to confirm the infection has fully cleared, since stopping treatment too early is a common reason infections return.
5. Addressing underlying causes, such as allergy management, for dogs with recurring infections.

Never use human ear drops or leftover medication from a previous infection without checking with your vet first, since using the wrong medication on a ruptured eardrum can cause serious harm, including hearing loss.

How to Help Prevent Ear Infections

• Dry ears thoroughly after swimming or bathing, especially for floppy-eared breeds.
• Clean ears regularly with a vet-recommended cleanser, particularly for breeds prone to wax buildup or moisture retention.
• Manage allergies with your veterinarian’s guidance if your dog has a history of skin or ear issues linked to allergies.
• Check ears weekly as part of a regular grooming routine, looking for early signs of redness, odor, or discharge.
• Avoid over-cleaning, since excessive cleaning can irritate the ear canal and potentially contribute to infection.

Frequently Asked Questions

How do I know if my dog has an ear infection or just needs cleaning? A healthy ear typically has minimal odor and a small amount of light-colored wax. Strong odor, dark discharge, redness, swelling, or visible discomfort when touched are signs it’s likely an infection rather than routine buildup, and warrant a vet visit.

Can I treat my dog’s ear infection at home without a vet? It’s not recommended. Ear infections can be bacterial, fungal, or parasitic, each requiring different medication, and using the wrong treatment can prolong the infection or mask a more serious underlying problem.

Why does my dog keep getting ear infections? Recurring infections are often linked to an underlying issue such as allergies, excessive moisture exposure, or anatomical factors like narrow ear canals. Your vet may recommend allergy testing or a long-term ear care plan for dogs with frequent recurrences.

Are certain dog breeds more prone to ear infections? Yes. Breeds with floppy ears, narrow ear canals, or hair growth inside the ear canal, such as Cocker Spaniels, Basset Hounds, and Poodles, tend to have a higher risk of ear infections.

The bottom line

Ear infections are uncomfortable but very manageable with prompt veterinary treatment. Catching the signs early, head shaking, scratching, odor, or discharge, and getting an accurate diagnosis rather than guessing at home treatment gives your dog the fastest, most effective relief. For dogs prone to recurring infections, working with your vet to identify and manage the underlying cause is the key to breaking the cycle.

This article is for informational purposes only and is not a substitute for professional veterinary advice.

Sources

• VCA Animal Hospitals: Ear Infections in Dogs (Otitis Externa)
• Merck Veterinary Manual: Ear Infections and Otitis Externa in Dogs