I needed a comfortable bed for my giant of a greyhound. He was forever moving from sofa, to floor to his old bed, and never really settling. I hoped the XL would be big enough for him as he is very leggy, and thankfully, I wasn't disappointed. Initially, when I opened the box, he started to have a go at it, thinking it was something to kill, but after I lay down on it (so comfy btw, didn't want to get up again!) he got the idea. So far, not moved for 5 hours!