I have a 5 month old miniture doxie who is just wonderful. I know every mom says this, but I think he is an over achiever! Anyway, he recently started sleeping on the heat runs when the heat is on. This is something new, as he usually would go into his crate to sleep or find a blanket. Should I be worried that he is cold or uncomfortable and searching out the heat for comfort? He is not shaking, and is eating fine.