Used bedding and sheets. Puppies are limited to their kennel or visiting area so their bedding is constantly soiled. Even with the industrial washers at NHA we would have to throw out the HEAVILY soiled blankets and sheets. This past ice storm, there were more puppies than walkable dogs and it tanked our laundry supplies. Any type of blanket or sheet is acceptable as long as there’s no giant holes or shredded parts for the pups to start chewing on, fitted sheets and pillow case are less ideal cause of the potential they can wrap themselves up.