Horse rug spec 1200d ripstop ( not slippy nylon ) ! waterproof ( both sides) non slip outer , with a zip .

It is  nearly twice the weight of normal dog bed covers  and is virtually indestructible

Please note NOT chew proof.  

It will give complete support and comfort to your pet and will keep its shape, made as a box and finished with piping this a quality liner comes with a tough zip.

All dog beds are sprayed against fleas

Can be hosed or jet washed ,and soap will not harm the waterproofing