Gotta love dogs!
We cover our camper mattresses with waterproof covers that have a "breathable" top surface so we're not sleeping on plastic. Waterproof cover -> fitted flannel bottom sheet -> bedding. Bedding in the camper is a pair of normal sleeping bags zipped together to make a king size bag. No sheets or blankets, we ain't making beds when were camping.
2006 Roo 23SS behind a 2017 Ford Expedition