Our waterproof covers are a great option in case your dog has major incontinence issues or if you expect your Bully Bed to be exposed to lots of fluids or moisture for long periods of time. Further, Our waterproof dog bed liner is also carefully designed to protect the foam of your Bully Bed from accidents, drool, urine or any liquid. Double up the waterproof covers for extra protection. These beds can also be used indoors when potty training a puppy or if you have an older dog who has the occasional accident. Please note, our waterproof covers need to be cleaned after accidents and should be wiped down at least once per month and the waterproof pet bed liner is easy to clean. However, this is not because the cover will not protect from liquids penetrating the foam, but because urine, vomit, and other bodily fluids will break down the cover over time and cause it to prematurely age.