My Saint Bernard, Chewy, was at the vet yesterday. His leg was fine. Last night I noticed he was limping and on his front leg, at the lower joint, there is now a huge lump! It's hard like bone, it's not fluid filled. I gave him his arthritis medicine and it hasn't seemed to help. He is still putting weight on it and is just limping, still using it a little. I called the vet and left a message. I will post a pic. Has anyone ever seen this before?? I am so worried about him