I don't know where you monetarily draw the line, honestly. I see both sides of the issue. I currently have an animal that has never, not once, had an accident inside, sleeper or house. I brush her everyday so there isn't even a pet hair issue. But then again, there are dogs and cats I know who have been allowed to virtually destroy and befoul living quarters, and the owners think that's normal. Destruction is what it is - if a seat is torn up from rough use or animal clawing, does it matter? Smells, stains, excessive hair - these can all be worded in a contract. I think I'd go with Cheri's idea and set the deposit according to a seriously detailed detailing.