Recently my 4 1/2 year old Brittany dog Rigby has been stiff and in pain in what appears to be his hind end. I first noticed a couple weeks ago when I would let him out of his crate in the morning that he seemed extra stiff and was walking with a different gait than usual. Well last week he really seemed to be in pain so I took him to the vet. They put pressure on areas looking for an injury but couldn't find one, but did also notice his lethargy and different walking gait so they prescribed an anti inflammatory to give him to see if that would help with the pain while he "healed". The pills seem to be helping with the pain but he still walks a little different and is still stiff in the mornings and still seems a little off. We are going to have a follow up with the vet soon but I was wondering what some of you think this could be? Early arthritis? something else?