Role of platelet rich plasma (PRP) to promote fracture healing has not been stated clearly. The aim of this prospective clinical study was to evaluate the effectiveness of plasma rich in growth factors (PRGF, derivate PRP) in the treatment of bone fracture occurs naturally in dogs. With the goal, sixty-five-dog with Goat Serum a radius / ulna or tibia / fracture of the fibula were randomly divided into two groups (PRGF and saline solution (SS) group) and examined at days 0, 7, 14, 21, 28, 35, 42, 49, 56, 60, 63, 70, 120, and 180. All fractures treated with external skeletal fixation, and pain is controlled with carprofen. Healing was evaluated by physical examination, limb function, radiographic, and by Likert-type questionnaires owner satisfaction. A more rapid healing of fractures observed in PRGF group, with a statistically significant difference against the SS. Swelling at the site of fracture was significantly greater at 14 and 28 days in animals injected with t...