My first was a big Trip around the World in blues, extra large because my ex was a covers thief, and we heated with wood, so if the stove burned out, it cooled off quickly. I used thick, thick batting because I wanted it to be warm, and handquilted that bad boy for months.
When my Great Dane, was a puppy, we left him home with the other housepets (he was a mama's boy even then) and he circled and dug a 3" hole through the quilt, a blanket underneath, 2 sheets and stopped short of the mattress pad. Came home to find Max sleeping comfortably in his "nest".
If I'm ever in a position to get another dog, I think it would have to be a Dane again. I loved that big guy more than my ex husband.