I have been through the same scenerio with Nikita ( our first rott ) and now with Monty. Rott's blow out their knees and when it hurts Monty won't stand on that leg or he limps. He's facing surgery down the road to repair this. I don't know if your baby is prone to this problem or not. Just certain breeds seem to get this problem. Well at least more than other breeds. It happened to Nikita while walking her and we were just 2 houses from home when it blew. However the vet says that it's happening over time and then the simplest thing can finish it off. I hope this isn't what's going on with your baby. You can likely find out on the net what problems are common with your dog breed. Gee I hope he feels better soon.

Healing hugs, Deb, monty and Kiki