My 5 year old Yorkie had diherrea for about a day and a half and before that his stool hadn't been great for about 2-3 days, last night he was very weak although we were keeping him hydrated with lots of water and baby food, when he got up he wouldnt place his hind leg, today his stool has gotten somewhat better but he just won't place his hind leg. He runs around and acts normally but doesn't olace his hind leg for anything. We've massaged it and checked his paws and all parts of his leg for injury but nothing is found. Other than pulling his leg after we've been touching it for a bit he doesn't show any pain. Does anyone know what's wrong or what we can do to make sure he is okay?