DOGS · Condition guide
Otitis externa in dogs: real veterinary cases
Otitis externa — inflammation of the outer ear canal — is the second-most-common diagnosis in UK primary care (7.3% of all dogs in a given year). Most owners think of it as a one-off infection. In reality, it's almost always a downstream sign of something else: underlying allergy (atopic dermatitis, food allergy), ear conformation (floppy ears, hairy canals), or moisture trapped after swimming.
Cytology is the single most useful test — a tape strip and a quick look under the microscope tells the vet whether they're dealing with yeast (Malassezia), cocci, rods (often Pseudomonas, which can be hard to treat), or mixed populations. Treating without cytology is the most common reason ear infections "keep coming back". For chronic or relapsing cases, identifying and managing the underlying allergy is what actually breaks the cycle.
What vets typically check for
- Otoscopic exam — check for foreign bodies (grass awns), polyps, ruptured tympanic membrane.
- Cytology of ear discharge — yeast vs. bacteria; rods raise concern for Pseudomonas.
- Culture + sensitivity if rods are seen or repeat infections aren't responding.
- Treat the infection AND investigate underlying allergy if the dog has recurrent disease.
- Severe end-stage cases: video otoscopy, CT imaging, total ear canal ablation (TECA) as a last resort.
Not a replacement for veterinary care. Use this to walk into the conversation prepared, not to self-diagnose.
Real cases from the veterinary literature
Peer-reviewed reports our semantic search surfaces for Ear infection in dogs (otitis externa). Click into any case for the full abstract — or run a personalised search with your pet's exact details.
- Aural Cholesteatoma (Tympanokeratoma) in Veterinary Medicine: An Update and Principles of Clinical Management.
Veterinary dermatology · 2026 · United States
A 7-year-old Bulldog was brought in for ear problems, including discharge and discomfort. The vet diagnosed a rare condition called aural cholesteatoma, which is a type of cyst in the ear that can cause significant issues. Treatment options included minimally invasive techniques, which showed better outcomes than traditional surgery. After undergoing an endoscopy-assisted proce
- Treatment of Meticillin-Resistant Staphylococcus Pyoderma With Rifampicin in 104 Dogs: Clinical Outcomes, Adverse Effects, and Rifampicin Resistance in Nonresponders.
Veterinary dermatology · 2026 · Australia
A group of 104 dogs with a skin infection caused by a tough-to-treat bacteria called MRSP (meticillin-resistant Staphylococcus pseudintermedius) were treated with an antibiotic called rifampicin for 21 days. Most dogs showed improvement, with 82.7% responding well to the treatment. However, some dogs developed resistance to the antibiotic, which means it may not work for them i
- Long-term management of recurrent otitis externa in dogs using a two-phase protocol involving ciprofloxacin-clotrimazole-betamethasone and topical hydrocortisone aceponate.
BMC veterinary research · 2026 · Brazil
A group of dogs with recurrent ear infections (otitis externa) were treated with a combination of medications including ciprofloxacin, clotrimazole, and betamethasone to manage their symptoms. After initial treatment, they switched to a topical medication called hydrocortisone aceponate for ongoing care. Over 90 days, most dogs showed significant improvement, with many not expe
- T-shape versus circular shape: a retrospective evaluation of intraoperative and postoperative complications in a cohort of 142 dogs undergoing TECA-LBO for end-stage otitis.
The Journal of small animal practice · 2026 · United Kingdom
A group of 142 dogs undergoing surgery to remove their ear canal due to severe ear infections (total ear canal ablation and lateral bulla osteotomy) were evaluated to see if the shape of the incision (T-shaped or circular) affected complications. The study found that dogs with circular incisions had more bleeding during surgery, while those with T-shaped incisions had a higher
- Curcumin shows promise as an adjunct in changing β-lactam susceptibility status of canine multidrug-resistant Staphylococcus pseudintermedius: an in vitro study.
Veterinary research communications · 2026 · United States
A study found that curcumin, a compound from turmeric, may help improve the effectiveness of certain antibiotics against a tough skin infection in dogs caused by multidrug-resistant Staphylococcus pseudintermedius (MDR-SP). This bacteria is often seen in dogs with pyoderma, a type of skin infection. When curcumin was combined with antibiotics like oxacillin and amoxicillin-clav
- Evaluation of the Antimicrobial Activity of a 3% Chlorhexidine/Ophytrium Mousse and Shampoo in 18 Healthy Dogs.
Veterinary dermatology · 2026 · United Kingdom
Eighteen healthy dogs were treated with a 3% chlorhexidine and ophytrium shampoo and mousse to see how well they could fight off skin infections caused by bacteria and yeast. The shampoo was effective even after just 3 minutes of contact, and the mousse continued to work for at least four days after application. Both products showed good results in preventing the growth of harm
Frequently asked questions
- Why do the infections keep coming back?
- Almost always because the underlying cause hasn't been addressed. The most common driver is allergy — atopic dermatitis or food allergy. Until the allergy is managed, the ear environment stays primed for repeat infections. Discuss allergy testing or a strict food trial with your vet if your dog has had ≥3 ear infections in a year.
- Are home remedies safe?
- No. Over-the-counter ear cleaners are fine for routine cleaning, but if there's any infection the eardrum status must be confirmed first — many topical antibiotics are damaging to the inner ear if the eardrum is ruptured. Vinegar, hydrogen peroxide, and other home solutions can worsen inflammation and irritate damaged tissue.
- What if it's Pseudomonas?
- Pseudomonas otitis is one of the toughest infections in small-animal practice — it forms biofilms and develops resistance quickly. Treatment usually requires culture-guided antibiotics, aggressive ear flushing (often under sedation), and prolonged therapy. Refer to a dermatologist or specialist if your dog has confirmed Pseudomonas.