Recurrent deep pyoderma in German Shepherd dogs with underlying ehrlichioses and hypergammaglobulinaemia.

Four German Shepherd dogs with recurrent deep pyoderma and associated ehrlichioses are described. All the dogs had already received appropriate long-term antibacterial therapy but the clinical signs had consistently returned within 3-4 weeks of cessation of the treatment. Haematological and serum biochemical findings, and indirect fluorescent antibody (IFA) tests were indicative of Ehrlichia spp. infection. Treatment with doxycycline monohydrate was associated with the return of blood values to within normal ranges and diminution of the IFA titres. No further episodes of pyoderma were observed during a 1-2-year follow-up period.