thank so much for the ansewr¡¡ this mornig he was so much better except for a slight limp in his left leg. The veterinary came to look him and said maybe was something whit his hip she said the was rare to happen with small dog and so young but not impossible,she gave him an injection for the pain and massaging and did not find anything unusual.she told us to give him some pills for pain during the course of the week and to give him massages whit one cream to relax the muscles. he look good, he can do his physiologica needs whit normally and he don’t lost his appetite so is pretty good¡¡the next week will take an X-ray just to be sure that there is nothing abnormal
please see the other answer.