Chronic otitis externa in dogs requires a two-phase treatment strategy: induction to achieve clinical remission, followed by proactive maintenance to prevent recurrence. Treating each flare in isolation without addressing the underlying cause leads to progressive inflammatory changes, antimicrobial resistance, and ultimately irreversible disease requiring surgery. Journal of the…

The first step in every case is cytology. Cytology should be performed at every otitis visit to guide topical antimicrobial selection and identify secondary pathogens. AAHA Clinical G… In difficult cases with abundant exudate, an in-clinic ear flush under anesthesia should precede cytology and otoscopic examination. AAHA Clinical G… Hypochlorous acid is a suitable flushing agent for chronic otitis externa; clinical and cytological scores decrease significantly after a single flush followed by twice-daily home cleaning, with no adverse effects reported. Veterinary Derm… Saline is an acceptable alternative flush with equivalent clinical outcomes at two weeks. Veterinary Derm…

Topical antimicrobial selection must be driven by cytological findings. Combination products containing an antifungal, antibacterial, and anti-inflammatory agent outperform antifungal monotherapy for Malassezia otitis externa. Veterinary Evid… For mixed Staphylococcus pseudintermedius and Malassezia pachydermatis infections, a single in-clinic dose of gentamicin, posaconazole, and mometasone furoate (Mometamax Ultra) achieves treatment success in 100% of affected ears at day 28, compared with 90.2% for twice-dosed florfenicol, terbinafine, and betamethasone acetate. Veterinary Reco… For cases where owner-administered therapy is used, a florfenicol, terbinafine, and betamethasone acetate gel administered once weekly for two doses achieves clinical remission (OTIS-3 score ≤3) in approximately three-quarters of dogs, compared with approximately two-thirds of dogs treated with a daily suspension comparator. BMC Veterinary… The OTIS-3 score ≥4 differentiates diseased from healthy ears with 100% specificity and greater than 90% sensitivity; a score ≤3 defines clinical remission. BMC Veterinary…

The primary underlying cause must be identified and managed — recurrent otitis is always secondary. Canine atopic dermatitis is the most frequent primary factor in recurrent otitis externa, and in some patients otitis may be the only clinical manifestation of allergic disease. Journal of the…+1 Predisposing anatomical factors should be corrected where possible, and perpetuating factors reversed. Journal of the…

Concurrent otitis media is present in 50% to 89% of dogs with otitis externa and requires targeted systemic antimicrobials for 6 to 8 weeks when confirmed. Journal of the…

Pain management is an essential component of treatment. NSAIDs are first-line analgesia for otitis-associated pain in dogs when corticosteroids have not been prescribed. If corticosteroids are already in use, acetaminophen (paracetamol) can be administered safely in dogs (not cats) in combination with corticosteroids. Gabapentin is indicated when a neuropathic pain component is suspected, as occurs in chronic otitis externa. WSAVA Global Gu…

Maintenance ear cleaning frequency should decrease over time — from daily during active disease to once or twice weekly as a preventive measure once remission is achieved. MSD Vet Manuals

Referral to a board-certified veterinary dermatologist is indicated for cases that are persistent or recur within 20–30 days over a 6-month period, or when there is no resolution after 3–6 months of treatment. Collaborative dermatologist care reduces median otitis recurrences from 4 to 2, extends median time to recurrence from 21 days to 171 days, and improves proliferative ear canal changes in 91% of cases versus 13% under primary care alone. Journal of the…+1

When medical management fails and disease is end-stage, surgical options include total ear canal ablation with lateral bulla osteotomy (TECA-LBO) or CO₂ laser ablation. TECA-LBO is the gold-standard surgical treatment for end-stage chronic otitis with concurrent otitis media unresponsive to medical management. Journal of the… CO₂ laser surgery is an effective alternative to TECA-LBO for proliferative and obstructive otitis externa when the horizontal ear canal remains patent and macroscopic calcification is absent; it should be considered whenever those criteria are met. Veterinary Derm… Most TECA-LBO and laser surgeries are avoidable with early, comprehensive medical management. Journal of the…

Would you like guidance on selecting the appropriate topical antimicrobial regimen based on specific cytology findings (cocci vs. rods vs. yeast)?