Many temperament tests exist to determine the aptitude of puppies from obedience to hunting. If the breeder has conducted any temperament test, ask them to share the results with you. Responsible breeders take every precaution to produce puppies that are free of genetic diseases. If something unforeseen DOES surface, a responsible breeder will normally have a system in place to deal with your special circumstances. All of these details need to be discussed prior to buying the puppy.
Responsible breeders accept a lifelong commitment to the dogs they breed.
No breeder wants to see one of their puppies end up in a shelter. The breeder should commit in writing to take the puppy back if you are unable to care for it, no matter what age the dog is. In return, they may ask YOU to commit in writing that you will not transfer ownership of the dog without contacting them first. If you want to hunt your dog, this may be critical. Your safest bet is to buy from a breeder that hunts their dogs.