American Kennel Club-good source of information on purebred dogs and dog sports
Orthopedic Foundation for Animals-Database for hip dysplasia, heart, elbow
Cat Fancier's Association-Registration body for purebred cats, information on breeders and cat breeds.
Bearded Dragon.org-Great forum on the care of the bearded dragon.
Patricia McConnell-One of the best animal behaviorist out there, located in Wisconsin. Great source for books and DVDs