For a small dog, I made a 'cover-up' ....a fleece-padded bed followed by several quilted squares and rectangles that folded over from all sides, made out of flannel, cotton, and/or more fleece. After watching a few small dogs burrow into blankets, this was made so a dog could 'dig' a way under the quilted pieces till reaching the fleece bed and then proceed to cover up by pulling over all the quilted pieces till 'happy and warm'. Biggest problem was how much fabric it took to make, plus the thickness of the bed to successfully connect with quilted sides. (someone with a serger or commercial machine would probably be more successful)!