Dachshunds love to burrow. I came home to this twice in the last few months. Pandora stuck in a shirt sleeve and then later Goliath stuck in a sweater sleeve. They both acted pitiful when I got home!
If you have ever stayed over at my house, you know that unless you want to be in dog heaven, then you better not get under a blanket. If you have a blanket you will be surrounded by five burrowed dachshunds! It worked great when the power went out in the middle of winter several years back. It was a five dog night and we all stayed warm!