It's very good. I think it should state something about the dog being a member of the family/indoor pet. I've seen that in a lot of contracts, and it's a good one.

I've never heard of the credit card/birth certificate thing, and it's definatly something that would make me a bit uneasy.

EDIT--I wanted to add that if there's forms, etc before you approve people, you should get enough information on them/have enough contact with them to know if they're the type of people to run off with a dog/give it away. Especially with references and such. Besides, if someone had an emergency/had to go away, I don't think the first thing they would worry about is contacting their dogs' breeder.