All surgical procedures were conducted aseptically and under general anesthesia. Perioperative analgesia included an intravenous injection of 1 mg/Kg ketorolac and 1.5 mg/kg tramadol early in the surgery. Additionally, 4 mg/kg of carprofen were administered before the effects of anesthesia had passed and during five days after surgery. Postsurgical infection prophylaxis was carried out by injection of enrofloxacin (7 mg/Kg, IM) during five days postoperatively