Beware of breeders who claim they have been breeding for 10, 15, 20, 30 or more years. If they have been, they should have a written contract/health guarantee by now that should be on their website for you to read over so you know what you are getting into. If you don't see one, they could be hiding something that they don't really want you to know until they get your money.
Some things to consider when searching for your puppy:
Are you willing to pay $800 or $1000 or even $1700 for a puppy without a written
What if the puppy has a congenital disease when you take him to the vet?
Without a written Health Guarantee, 99% of the breeders who don't have a Health Guarantee will tell you it's your puppy, do what you want with it.
Are you willing to buy a puppy for several hundred dollars and not see a written Health Guarantee up front before you place a deposit, that will be non-refundable?
If someone claims their dogs have lots of champions in their bloodlines, ask to see the 5 or 6 generation pedigrees. (3 generation is not good enough) If they can't produce any, and the dogs are AKC, look on AKC website, as it is a public record. (You shouldn't have to do that, they should provide it) You do need the dog's registered name or registration number.
These are a few of the "food for thought" you should be aware of.
Will the breeder allow you to visit their kennel so you can see where
the dogs and puppies are housed?
Can you meet the sire and the dam?
Do they look well fed and have shiny coats?
Are the kennels clean?
Keep in mind that visiting a kennel while the puppies are under 7 weeks of age, can stress mom and the entire litter. You are strangers to them.
(I would not recommend visiting until after the pups are at least 7 weeks old. Keep in mind that some breeders may have had a horrible experience of losing a litter because someone brought Parvo onto their property. Parvo is highly contagious, deadly, costly and heartbreaking to the breeder.)