The esophageal tumors are rare in dogs, less than 0.5% of the tumors reported. The findings are causal leiomyomas. Can be found most commonly in the distal esophagus, especially in the lower esophageal sphincter. These tumors generally are at an advanced stage when the first clinical signs appear. A dog of eight years of age, race Dalmatian male weighing 19 kg, was met at the Clinical Hospital of Veterinary, UFRGS, with a history of sialorrhea, regurgitation, abdominal pain and progressive emaciation. The simple radiographic examination showed increased radiopacity in the region of flow near the diaphragm esophagus. In the endoscopic examination is viewed tumor near the entrance of the lower esophageal sphincter and the gastric fundus, and collected samples for histopathology. The result was the histopathological hyperplasia and gastric esophageal leiomyoma. Protein calorie malnutrition because of the animal and difficulty in swallowing, it was defined as nutritional support, the placement of the probe by endoscopic gastrostomy is a form of medical treatment in animals with esophageal tumors, seeking relief in dysphagia. One week after placement of the gastrostomy tube, the patient persisted with regurgitations and with emaciation, opting for the conventional surgery to remove the tumor. There was the resection esophageal and gastric-esophageal anastomosis, the tension was relieved by incision of relaxation, three cm cranial of the anastomosis. After three days post-operatively the animal came to death. At necropsy of the animal was not observed macroscopically and microscopically significant change was suggested renal. The endoscopic information about the position of the tumor in the esophageal wall guides the surgical approach. Surgical procedure in the esophagus has many postoperative complications such as dehiscence and stenosis, and some factors contribute to the tension at the site of the surgical wound, the movement of the esophagus, the lack of serosa and also the lack of omentum. The surgical procedure was effective in another study where it was held only a suture line the esophagus to remove a sarcoma, the animal had a good quality of life associated with chemotherapy. A partial circumferential myotomy may reduce the tension in the anastomosis, it heals by second intention to occur without constriction or formation of diverticula. The excision of tumors in the esophagus is considered a technically difficult and presents a series of post-operative complications, but it was the treatment of choice for the case reported.