Yeah, he's about a year and a half isn't he Caren?
Maybe he's just getting tougher
LOL
Hades is a lap dog, Roxy isn't. SHe prefers to lie right by the front door (which isn't far from the living room) and if she's not there she's somewhere close to the door.
As squiddy said too, the floor is cooler so he might be trying to escape the heat.