The second I took it out of the box my pibble climbed in to test, and definitely gave it the seal of approval :)We got the 36 inch size. My pibble is 60 lbs, and my 40 lbs mini bull terror can squeeze in and snuggle, too.This will be great in the winter when they get cold. Currently, I wrap blankets around the rims of their beds for extra warmth. This essentially does the same thing, as they squish down into the center of the bed.They both like this one the best out of all their various beds, soSee full review