1. DermatoDiagnostics, Edmonds, WA 98026, Phoenix Central Laboratory, Everett, WA 98204, and Department of Comparative Medicine, University of Washington, Seattle, WA 98195, USA,
2. Mesa Veterinary Hospital, Mesa, AZ 85205, USA,
3. Animal Skin and Allergy Clinic, Lynnwood, WA 98037, USA,
4. Phoenix Central Laboratory, Everett, WA 98204, USA,
5. Department of Comparative Medicine, University of Washington, Seattle, WA 98195, USA