American Kennel Club (AKC)— The AKC was established in 1884 to promote the study, breeding, exhibiting and advancement of purebred dogs. They also have a listing of medical problems associated with certain breed types, this list is a valuable resource
Animal Planet— Along with breed listings, it also has the videos from their popular “Dogs 101” series.
Dog Time— A good place to explore “all things dog”. Aside from a comprehensive list of breeds, they also offer a dog match-up quiz and top dog names.
Dogster — Not only breed information, but also a directory of dog parks near you.
Pet MD— Offers a “Dog Breedopedia” that was authored by veterinarians.
Purina — This pet food giant focuses its listings on helping to choose which breed is right for your household. Breed offerings can even be filtered by various common traits and tendencies.
Vet Street— Provides a wealth of breed, trait and care information, some with a humorous twist.