Oronasal fistula after canine tooth extraction in dogs
10-year-old Dachshund that had its upper left canine extracted for periodontal disease a month ago. Since then it has had left-sided mucopurulent nasal discharge and sneezes when drinking or eating. A communication with the nasal cavity is visible in the socket.
What is the appropriate treatment?
chevron_right Show answer and explanation
A. Antibiotic for 3 weeks until it closes by second intention
An established, epithelialised oronasal fistula does not close with antibiotics; the discharge will persist while the communication exists.
B. Rhinoscopy and nasal biopsy to rule out a tumour before any treatment
The history and oral examination explain the signs. The nose would only need investigation if the discharge persisted after closing the fistula.
C. Surgical closure with a tension-free mucogingival flap over healthy bone
Correct. A chronic oronasal fistula does not heal on its own. It is repaired with full-thickness flaps, without tension and with the edges supported by bone; tension is the main cause of dehiscence.
D. Fill the socket with bone wax and suture the gingiva directly under tension
Sutures under tension readily dehisce, and bone wax is a foreign body that promotes infection.
lightbulb Key takeaway
An oronasal fistula can also develop without extraction, from deep periodontal disease on the palatal side of the upper canine, especially in chondrodystrophic and long-nosed breeds. Probing the palatal side of the canines is part of the work-up of any unilateral nasal discharge.
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Updated: October 31, 2026 · Educational content for veterinary professionals. It does not replace current clinical guidelines or the judgement of the attending veterinarian.