Thought this would be great for my Italian Greyhound that likes to feel secure when sleeping but the sides are thicker/ heavier than the bottom that is very thin. It falls over w her in it and is too floppy to offer support. Thought of going down a size since I got the medium for an 18 lb dog who'se all legs but cost $14 to return and the small is a full 6" less in diameter which ppl say barely fit a kitten. Another bed fail for her I guess. They need to put some structure in the sides. Even cardboard would help or maybe a bean bag in the base. I tried filling it with blankets but it still falls over when she leans on the sides and doesnt "hug" her because shes very skinny so quite alot of extra space