This happened to my friend's chihuahua. He was the biggest tiny baby ever. Sometimes dogs just get traumatized after things like that. He just moved to a new home, he's small, getting used to the sounds, new people, etc. He should stop after a week, if not I'd take him to a new vet to see if they did something wrong. More than likely it's just him being the little baby that he is! Remember puppies are like little kids!
