Okay, so I have a senior dog with really bad hip problems who must have an orthopedic foam bed. However, she is the type of dog to dig in her bedding, circle, and then lie down. As a result, she ruins $100 beds fairly regularly, and we have to break this cycle. We've been unable to get her to stop digging and clipping her nails doesn't seem to help, so we figure the best thing to do is to just make our own semi-indestructible bed.

We know where we can source good foam. I'm having an issue, though, selecting cover materials. I'm looking for a fabric that is very durable and will be somewhat resistant to the digging, while still being comfortable enough to sleep on and safe to machine wash and dry.

Any ideas?