Perianal fistulas in German Shepherds: treatment of choice
6-year-old male German Shepherd with dyschezia, tenesmus, constant licking of the anal area and a foul smell. Under sedation, multiple ulcerated sinus tracts are seen surrounding almost the entire circumference of the anus.
What is the initial treatment of choice?
chevron_right Show answer and explanation
A. Wide surgical excision of all tracts and bilateral anal sacculectomy
With such extensive lesions, surgery carries a high risk of faecal incontinence and anal stricture, and relapse is common. It is reserved for residual lesions after medical treatment.
B. Broad-spectrum antibiotics for 6 weeks as sole therapy
Infection is secondary; the disease is immune-mediated and antibiotics alone do not control it.
C. Oral ciclosporin (may be combined with ketoconazole to reduce the dose) with a hypoallergenic diet, and topical tacrolimus for maintenance
Correct. Anal furunculosis is an immune-mediated disease; ciclosporin achieves resolution or marked improvement in most dogs. Relapse is common when it is stopped, so the lowest effective dose is sought.
D. Tail amputation, since the broad tail base is the main cause
Tail conformation was proposed as a factor, but amputation does not treat the immune-mediated disease and is no longer recommended as treatment.
lightbulb Key takeaway
Anal furunculosis in German Shepherds is associated with inflammatory bowel disease and food sensitivity: a hypoallergenic diet helps. With ciclosporin and ketoconazole, monitor liver function and gastrointestinal side effects.
Test yourself with 10 random questions
Gastroenterology · 100 questions, a different test every time
Related questions
Updated: October 31, 2026 · Educational content for veterinary professionals. It does not replace current clinical guidelines or the judgement of the attending veterinarian.