Don't Wanna be a party pooper, but I have some questions?

Why do you think this breeder is reputable?
Have they done the proper health screening on their dogs (Hips, Elbows, Eyes, Thyroid, etc?)
Do they breed for show, field, or "just for pets"? (Just for pets is a HUGE red flag).
How many litters a year do they breed?
How many sets of shots do they get? Wormings?
Do you have AT LEAST a two year hip guarantee in the contract?
IS There a contract? (there should be).
Will the breeder take back the dog at anytime should you no longer be able to care for it? No matter how old it is?
Can you get references from this breeder?
Have you seen the (possible) kennel and conditions the dogs are kept in?

These may seem like instrusive questions, but you should know the answer to all of them ^_^