They wouldn't know. Will have comprehensive information available for you. Usually not No - well unless you are buying more products from their store. The breeder stays in very close contact with these. Will tell you about the faults in their dogs.
All dogs have good points and bad points.
A good breeder knows this. The decision to get a puppy should not be taken lightly, and you should work to find the right breeder for you. Remember, a puppy is not a commodity. Feel free to email me .