I wouldn't give your dog back to the *itch but I would make it my mission to advertise what kind of place she has - take pictures of your pup and the registration paper and post them around town, online, free newspapers, etc. Make sure you only tell the truth so she can't turn around and sue you, but be loud and proud and as mouthy as you can - after all you have $400 worth of advertising coming to you, don't you???