For most breeds the top two health issues are orthopedic and eye problems so OFA and CERF clearances will be mentioned frequently. For more information about Hip Dysplasia see this link , and for eye disorders this one . Other places to check are your local veterinarians, boarding kennels, and dog trainers. Many will keep the phone numbers of their clients that breed, and in some areas they will have directories published by the local clubs with the names and numbers of breeders in their area. If you do take this route, please make sure to have taken the time to investigate the issues that are important with any breeds you are considering.
Many reputable breeders have web sites.
Most of these people use their sites primarily to educate the public and tell you about the breed and their own dogs. Sites where the sale of puppies is the primary focus or where you can order a puppy through a feedback form should send up warning flags to you. Take the list of questions above and the Code of Ethics from the breed clubs and ask the breeders that you contact about all of the issues. If you are at all uncertain that a breeder meets your standards for responsibility, then don't buy. If you find it impossible to find both a dog of the breed you want and a responsible breeder in your area you may need to consider shipping a dog in from another part of the country.