When mine are cold, I put on their sweaters. Doggie sweaters from Sally Wallis. She has them for sale, if anyone wants to see them. The profits go to rescue.
We don't get winter like you folks back east, but the damp cold can chill a b.
My girl lives in her sweater and either on the vent, or in her dog bed, by the computer, under her dog blanket.
I must say, when its cold, they stay in bed as long as possible in the am.