I've been with my puppy Nala all day today, and she hasn't fallen or run in to anything. Up until around 10:00 Pm she was fine. When I tried to pick her up off the couch she growled at me and I thought she was just upset I had woken her up. But when I set her down on the floor she had problems getting up, and started limping when she did. Now she can't put any weight on her back right leg. I don't understand what's happening? I'm going to call the vet tomorrow, but I thought maybe someone here might know. This may be completely unrelated, but at the beginning of the week she was sick and vomiting but she's been fine since then. Could this be Hip Displaysia? Or what? I'm really worried about her... Thanks.