American Kennel Club - The American Kennel Club, a not-for-profit organization established in 1884, maintains a purebred dog registry, sanctions dog events and promotes responsible dog ownership.
Companion Animal Recovery - Largest pet recovery organization, based upon the use of microchips for pets, but does include registering of tattoos.
Orthopedic Foundation for Animals - Registry of genetic-related disorders in canines and felines. Original focus on hip dysplasia has now been expanded to include a registry on all health-related problems including cardiac, thyroid, DNA and CERF registries.
Canine Eye Registration Foundation - Registry for eye-related diseases in dogs.
Optigen DNA Testing - Organization that performs DNA testing for various breed-specific diseases.
AKC Canine Health Foundation - Breed specific health-related information.
American Veterinary Medical Association - General pet health information.
Infodog - Information on dog shows, including conformation, obedience and agility.
ASPCA Animal Poison Control - Great information on toxic/hazardous substances for pets, plus toll-free poison control hotline.
American Dog Owners Association - The American Dog Owners Association preserves the special relationship between dogs and mankind by protecting and defending the rights of responsible dog ownership, opposing detrimental and supporting appropriate regulation for dog owners; educating the public and promoting standards for safe and civilized treatment of dogs.