He started limping yesterday and by bedtime he was walking on 3 legs. He was also whimpering every once and awhile. We have a vet appt. this afternoon. I carried this 50+ pound baby up and down my stairs (lost count of how many times) and outside to potty and downstairs to be with us, etc. My daughter said he is putting weight on it this morning (I'm at work). I will still be taking him in...he gets his last set of shots today anyway. He is really clumsy....trips down the stairs sometimes. ?? Hopefully it is nothing serious. I was reading all the posts on hip dysplaysia last night and about cried. He is just 16 weeks old.