Hi My 3 year old bulldog has been sleeping a lot lately. I'm not sure if ther is something wrong with him . I had thought to have his thyroid checked. He had lost his fur on his sides a few months ago and some people say that can be a sign of a thyroid problem. He usually doesn't sleep this much. Maybe he is getting older he just turned 3 and he has calmed down so much. He doen't like the heat but it wasn;t hot today and he still slept most of the day. Any comments?