Oh my how scary that must of been. I'm glad he's ok.

Thats one of the many reason why my pups don't wear collars. Nanook once got his tags & collar stuck in the heater vents and couldn't free himself. Thank god I was there and the heat was not on. Ever since my pups do not wear their collars indoors unless I am right there to supervise them. If I leave or go to sleep they are naked.