My dog is obsessed with the Dreamer blanket from Comfrt. I bought it for myself, it’s a bit too pricey for a dog blanket. But she loves it so damn much that I gave it to her. It’s like a soft, furry blanket with 2 layers. She gets ridiculously excited when I wash it and take it out of the dryer all warm.

Here is the link to the blanket, I’m sure you can find something similar for less: https://comfrt.com/products/the-dreamer-blanket?variant=43830935650348

Edit: I put it on her memory foam bed. She seems to like the combo of a firmer bed with a soft blanket.