Caires, Carla Emanuela Tertuliano, Veterinary Hospital, Veterinary School, Department of Veterinary Clinic and Surgery, Federal University of Minas Gerais (UFMG), Belo Horizonte, MG, Brazil. CORRESPONDENCE: G.E. Lavalle [gleidicel@yahoo.com.br]. Av. Antônio Carlos n. 6627. CEP 31270-901 Belo Horizonte, MG, Brazil., Brazil