This is my houndses favorite bed and because of the covering material they never dig/nest.

https://www.amazon.com/Best-Friends-Sheri-Calming-Cuddler/dp/B07BB68BCS/ref=sr_1_5?dchild=1&keywords=Best%2BFriends%2Bby%2BSheri%2BLuxury&qid=1587687381&s=pet-supplies&sr=1-5&th=1

Mine aren't huge fans of memory foam and like something squishier instead. I have this one and they love it: https://www.amazon.com/gp/product/B07BB68BCS But yeah that's plenty big.