I wasn't sure what size to order. I'm about 5'3" and when my dog stands on his hind legs, he's the same height as me. He also weighs about 140, so I needed a pretty big bed. I was worried about the filling and it flattening out after he slept in it, but I've had it for over a month now & it's holding up great! Super comfy. Dog likes it, hubby likes it (lol), kids climb in and lay in it - everyone fits! I highly recommend it. I might have been able to go one size down, just fyi in case anyone has the same size dog as me, but limited space for a dog bed.