I can guarantee you that my lawn mower will cut the grass.Or that my truck will run. But with a dog you can only tell a man what he did for you. You assume alot when you do otherwise. Unless you really know the person you have no idea what conditions the dog will have to live in. He may never do it for the other guy. I know we've all seen dogs, all of a sudden, for whatever reason quit or start picking up faults. I don't guarantee dogs.....

10 day guarantee should be a plenty. Gives a dog time to settle in. I would post his name Ed , people like him don't deserve to own a dog....