cold weather and bipolar terriers

So cold weather brings out the snuggle bunny in our boy. He sleeps a lot! Tug will snuggle down into his blankets after making them into a nest and snooze with his head tucked under an edge. He doesn't just do this in his crate but also in our recliners (barker-loungers) and on his soft dogbeds (piled one on top of the other).

Then, there's the flip side- some days he runs around the house like a lunatic. Just real frisky and giddy. Cool weather brings different smells and, if it's not too cold, he doesn't get overheated so his "play" just keeps escalating with no shut off valve!