Is Caused to parasitism by nematodes of the Spirocerca Sort, That Affect dog and other carnivores (wolf, fox, coyote, jaguar, lynx, leopard and only sporadically to the cat), Characterized by the presence of nodular injuries in the esophagus and aorta and, more rarely, in the stomach, digestive with respiratory and nervous manifestations. In the present work 10 canine were analyzed. I sacrifice them in humanitarian way to make the autopsy findings were the anathomophatologic: esophageal nodules of 3 and 5 cm of diameter, Which contained 3 and 15 S. lupi nodules whitin the respectively. Were Obtained weave samples, histopathology alters processing for STIs.