Well I live in Maine where it is very cold these days... And because of the high heating costs I keep my thermostat down to 62 at night... We ll Lucy ( my maltese) doesnt seem to be affected by the cold nights but the other night I guess Cooper my yorkie must have found it a bit chilly.. He woke me up flipping the blankets up with his nose over and over again until he could crawl in... then he laid up against my back in a little ball where he stayed all night... LOL I guess I will have to get out his fleece pajamas that I keep in case of power outages which we always have in the winter!!!!