Mr B has always had a problem with overheating. For his last birthday I bought him a large Coolaroo pet bed. That’s kept in our bedroom for nights when he gets too uncomfortable in our bed. He also has a cooling collar (worn in these photos) and a Cool Pet Pad.
The problem has gotten worse since he diagnosis though so I ordered another to keep in the living room. It’s next to my desk which he seems to find comforting, and under windows so he can enjoy the fresh air and breeze.