We bought a medium & a large for our 55 LB lab. He LOVES both. He settles right in to his bed when we sit down to watch a movie. He also goes to his bed to watch us if we are up & doing things he can’t be involved in (cooking or cleaning). 

The large bed is big enough for two of him, so my son will crawl into the dog bed & snuggle with the pup. It fits them both quite nicely LOL