After coming home from work I called my 8 year old pit bull mix Rocky to go out. He did not come as usual. I found him standing in my bedroom on his rear tip toes and his tail tucked between his legs. He tried to walk on them but was having difficulty. I felt is legs, hind qaurter area, abdomen and tail with no obvious injures and he did not appear in any discomfort or pain. I helped him to his bed to rest. This condition continues today. I have seen him stand like this before after getting up from a lying position but he usually recovers after a moment or so. I am very worried now. Can anyone help? I do have pictures I can send if needed. Please email me at email@example.com with comments.