Sonic Mattress
They sell rubber floor mats at Gm for the car. They look nice and should keep some fur out.
Have any pics of the matress you made? I was looking for the same idea in mine for little camping trips if it rains too much
I don't sadly, I am making a new one after this last trip I found a better pattern to keep the pieces from separating. Once I do make my second one I will let you know. Lately we have been using our hammock tent with the summer months being so dry over here.
Best advice I can give would be what I did for mine:
I bought a Queen size memory foam mattress topper (going with actual memory foam pieces next time) folded it in half and cut the bowed side to make two flat pieces, it was beveled so I pushed those pieces to where they would match up, the best they can. Cut off any excess and the proceeded to make a giant pillow case, used buttons to keep the case on and viola! giant memory foam pillow/mattress thingy.
This next time I am going to buy two large rolls of memory foam they are about 2 feet wide each and the length is about 6 feet, I found them at Joann fabrics, But you can probably find them anywhere online. Then I am going to actually make two different casings for each them from the same fabrics to keep them closer together putting extra stitching between the pieces for extra support and pulling them more taught together. Then again large piece or even making custom size sheet. Another cheat is getting a crib mattress.
The issues with all of these though is it usually leaves a gap and you will be in tight spaces. We put all of out stuff on the floor and we brought extra pillows to fill in the gaps left from the mattresses where we knew we would want to be able to lay.
Anyways sorry for the long post. Hopes this helps.