Do you require kennels/crates?
We just started sitting for Rover and in our profile we say something like, "we're happy to watch your crate trained dog." But a few clients have had dogs that do not use kennels. We decided to give them a try and one was just fine but the other 2 have not been fine. One chewed up some furniture and one had quite a few accidents, even though the owners said he was housetrained. Do you insist on kennels?