I bought bigger beds than what was suggested for our 3 mixed breed labs (the jumbo size (they all weigh 45 lbs.  or less). I wanted our 3 dogs to be able to spread out and rest or not rest their heads on the "arms" of the bed. I like that there are three "arms" and one that is left open. It gives them more free range to rest as they desire, as all 3 like different positions. For reference; we have a puppy that is 9 months, a toddler that is 2 1/2, and a senior who is 10. They ALL enjoy these beds. We love finally having matching beds and that actually look classy. It was important for us to be able to unzip the cover so we could wash it as needed. They come tightly balled up upon delivery, but don't worry, they spring right into shape after opening.