Neutrophilic and ulcerative dermatitis is reported in a mixed breed dog. The condition wasconsidered to be an atypical case of pyoderma gangrenosum. Clinically, it had a more superficialulceration, a more pronounced pustular component and lacked the characteristic cutaneous painand tenderness of the lesions. The diagnosis of pyoderma gangrenosum was made as a diagnosisof exclusion. The dog showed an excellent response to treatment with ciclosporin (Cyclavance,Virbac, Leuven, Belgium).