Echeverry DF, Gil F, Laredo F, Ayala MD, Belda E, Soler M, Agut A. Department of Animal Health, Faculty of Veterinary Medicine and Zootechnic, Universidad del Tolima, Ibagué, Colombia. Vet J 2009 Sep 14 Ten canine cadavers were used to investigate the anatomy and ultrasonographic approaches to the sciatic (ScN) and femoral (FN) nerves and to assess the accuracy of an ultrasound (US) guided technique to locate and block these nerves in the dog. The nerves of four sedated dogs were sought using US, blocked with 1% lidocaine and successful location confirmed by peripheral neurostimulation. The ScN was identified by US in all cases whereas the FN was not located in all cases. This study validates the usefulness of the US-guided technique to locate and block the ScN at the midfemoral level but the acoustic window of the inguinal region was less successful for locating and blocking the FN.