Need advice to keep my short-haired dog warm in winter

Hi everyone, I have a big short-haired dog (a Rhodesian Ridgeback) who stays in an indoor space at night, but the door is open so he can go outside to pee and poop when he needs to. The problem is that the floor is made of stone, and it gets really cold during the winter.

I’ve tried giving him blankets and rugs, but he ends up tearing them apart with his teeth. I really want to keep him warm and comfortable, but I’m not sure what type of bed, rug, or setup would work best for a dog like him — something warm but also durable and safe.

Has anyone been in a similar situation or found a good solution for a dog that destroys everything soft? Any advice or product suggestions would be super appreciated.

Thanks in advance!