Lotte is a little french bulldog who weighs just over 10 kilos (25 lbs), but we got her the medium bed so she could really stretch out. She's definitely getting used to sleeping on it and it's very comfy cozy. I would say the one thing she probably wishes is that the side bolsters were were a little bit higher, because she likes to side sleep right up against the edge. It's a great addition to her nap all day game!