American Kennel Club (AKC) http://www.akc.org/
Started in 1884, the AKC is the oldest and probably largest registry of purebred dogs. They provide for registration, pedigrees, performance and conformation titles, education, health and genetic issues and more. Most reputable breeders of recognized breeds register there dogs and puppies with the AKC.

Labrador Retriever Club (LRC) http://www.thelabradorclub.com/
The LRC is a nationally based club dedicated to preserving the integrity of the breed. Formed in 1931, the club has a rich history with past and present members and is recognized as the parent club of the breed by the AKC.

National Labrador Retriever Club (NLRC) http://www.labradorretrievers.org/
The NLRC was organized in 1996 with the idea of creating a national club that would preserve and promote the Labrador Retriever.

Orthopedic Foundation for Canines (OFA) http://www.offa.org/
The OFA was founded to collate and disseminate information concerning orthopedic and genetic diseases of animals and to advise, encourage and establish control programs to lower the incidence of orthopedic and genetic diseases.

Canine Eye Registration Foundation (CERF) http://www.vet.purdue.edu/depts/prog/cerf.html
CERF was founded by a group of concerned purebred owners/breeders with a goal of eliminating heritable eye diseases in purebred dogs through registration, research, and education.

OPTIGEN http://www.optigen.com/
OPTIGEN is a service company established to provide DNA based diagnoses and information about inherited diseases of purebred dogs.

Veterinary Genetic Disease Research (VetGen) http://www.vetgen.com/ 
Using VetGen's services, combined with valuable DNA Profiling and DNA Storage, animal breeders and owners have the opportunity to eliminate targeted inherited diseases in a growing number of breeds.

Info Dog http://www.infodog.com/default.htm
InfoDog is a totally interactive web site dedicated to the sport of Dog Shows and is a great web resource for information on AKC Dog Show statistics & schedules and quality dog products & services.

Jack Onofrio Dog Shows http://www.onofrio.com
Jack Onofrio Dog Shows is a dog show site very similar to Info Dog.

Wiscoy Labrador Retrievers http://www.wiscoy.com/kennellinks.html
We are including this link as a connection to find other Labrador sites.