I ordered the medium and it works perfectly for my dog. The bolster is great. She has enough space to spread out but it’s cozy for her to form a little. ball ￼Not sure how long she is but she weighs 38 pounds. The bed takes up about 13 of my couch. ￼ the hangover flap does cover the front of my couch, but I can see how it wouldn’t cover larger couches. ￼