Dog ear infections are frustrating, smelly, and painful—and often keep coming back. This episode is part of the HEAR NOW series (Help, Educate, Assess, Regulate), created in partnership with Merck Animal Health. In this two-part series, expert guest Dr. Christine McKinney, Merck Animal Health Small Animal Dermatology Specialist, joins to answer the most frequently asked questions about dog ear infections to give pet owners the clear, evidence-based information they need.
In Part 2 of our HEAR NOW series, they explain what brown discharge really means, why infections may not go away, the risks of untreated infections, and why home remedies can do more harm than good. Learn safe, effective treatments to help your pet.
What Is That Brown Gunk in My Dog’s Ear?
Many owners describe their dog’s ears as “smelly and yeasty” when they see brown discharge. But not all gunk is infection.
Normal earwax is common.
Overproduction often signals inflammation.
Smelly, itchy, or painful ears may indicate yeast or bacterial infection.
Only cytology—an ear swab examined under the microscope—can reveal if yeast or bacteria are present.
Why Didn’t the Ear Infection Go Away After Treatment?
This is one of the most frustrating experiences for pet owners. Common reasons include:
- Lack of anti-inflammatory support to reduce swelling and pain.
- Resistant bacteria, which require stronger or different medications.
Uncontrolled allergies, causing ongoing inflammation that sets the stage for infection.
Ear infections are usually inflammation first, infection second. Addressing the inflammation and finding the primary cause helps the infection resolve faster.
Why Ear Infections in Dogs Need Treatment Fast
It’s tempting to see if an ear infection will “clear on its own” or to try home remedies. But untreated infections can:
Progress to painful middle ear infections (requiring advanced care like CT scans or ear surgery).
Lead to permanent balance problems from inner ear involvement.
In rare but severe cases, cause life-threatening infections.
This French Bulldog has facial nerve paralysis due to a severe infection of the middle and inner ears, causing a lack of motor and sensation to the right half of his face.
The Problem With Internet “Home Remedies” for Dog Ear Infections
Apple cider vinegar, hydrogen peroxide, oils, and other home treatments are popular online—but they can burn inflamed ear canals or damage hearing. Alcohol and higher concentrations of acid may be irritating or cause a burning sensation in ulcerated ears.(Muller et al., 2013)
Safer options include veterinary-recommended ear cleaners (many are available over the counter) and prescription ear medications. Always check with your vet before putting anything in your dog’s ears.
Treatment Options for Dog Ear Infections: Why One Dose Can Help
Mometamax Single™️, a single-dose, in-clinic treatment from Merck Animal Health, is a new option applied directly in the clinic. It provides:
Triple action with antibacterial, anti fungal, and anti-inflammatory activity.
Rapid, reliable and long-lasting relief for more than 4 weeks.
The only single-dose treatment approved to treat Pseudomonas aeruginosa, a frustrating bacteria associated with severe ear infections.
Always talk with your veterinarian about whether this option is right for your pet.
Mometamax Single™ (gentamicin, posaconazole, and mometasone furoate otic suspension) – IMPORTANT SAFETY INFORMATION: Mometamax SingleTM is for otic use in dogs only. Do not use in cats. Mometamax Single should be administered by veterinary personnel. Do not use in dogs with known tympanic membrane perforation. The integrity of the tympanic membrane should be confirmed before administering the product. Reevaluate the dog if hearing loss or signs of vestibular dysfunction are observed during treatment. Do not use in dogs with known or suspected hypersensitivity to gentamicin, posaconazole, or mometasone furoate. Avoid contact with eyes. For complete instructions and safety information, refer to the product label.
How to Prevent Ear Infections From Coming Back
- Work with your vet to identify underlying allergies.
- Reach out to a specialist for expert evaluation and treatment.
- Follow up on recheck visits to confirm infections are gone.
- Use maintenance ear cleaners as recommended.
- Make ear handling a positive experience with treats and gentle practice.
Conclusion
Ear infections can feel overwhelming, but with the right veterinary guidance, treatment, and prevention plan, your dog can go from miserable to comfortable again. Remember: don’t wait, don’t DIY—call your vet.
Reference:
- Muller, George H, et al. Muller & Kirk’s Small Animal Dermatology. St. Louis, Elsevier, 2013. Ch 19. Diseases of Eyelids, Claws, Anal Sacs and Ears.
