I have a 6 month year old F5, the past couple weeks I have noticed him slowing down and not acting himself. He is just lounging around. If I do try to play with him, he has the interest in doing it, but it seems to hurt to move his hind end. He acts as if he doesn't have the full mobility in the hind end, he can be a little wobbly at times. I checked his temperature its 101.2, he is eating,drinking, and using the litter pan normally. His bowels are normal as well. His gum color seems to be a little lighter than normal...but doesn't seem threatening. What scares me about this all, his father just passed away this weekend from auto immune disease. I was wondering if you would have any idea of what it may be?