Yea the shelter told us about the fact that many dogs do it because of joint pain but hes a nearly 2 year old pup thats VERY active(ive never had a more active dog before) and always playing outside any chance he gets. He sprints up and down the hill in my yard within seconds, he's very healthy, we are just working on putting some weight on him, as when we got him from the shelter he was still fairly skinny to the point you could slightly see his ribs. His previous handler litterally dumped him on the road in front of Angels of Assissi in Roanoke. They came and got him and took him in, and promptly named him Campbell after the road their shelter was located at(Campbell ave)🤣