My Humphrey boy has been having a problem with his left back leg when he first wakes up in the morning or after a long nap. He seems real reluctant to put any weight on it when he first gets up. After a few minutes of walking around it seems to be better. When I get home from work at night, he runs around like a crazy dog, so the leg doesn't bother him all the time. Is it possible he has arthritis? He's only 3 (we think). Any thoughts?