Fédération Cynologique Internationale (FCI)
The FCI is a large international organization that recognizes and standardizes dog breeds globally. It brings together more than 90 countries and recognizes more than 340 dog breeds. Their site offers breed standards and information on dog events around the world.
American Kennel Club (AKC)
The AKC site offers a large amount of information about dog breeds, including detailed profiles, breed standards, owner tips, and dog training resources.
The Kennel Club
This is the British equivalent of the AKC. The site offers similar information on dog breeds, dog shows, and other helpful resources.
DogTime is a site that offers in-depth information on many dog breeds, care tips, dog training articles, and interactive tools to help dog owners.
The Spruce Pets
This resource offers dog breed information, care tips, training guides, and other helpful information for dog owners.
Wikipedia - List of dog breeds
The Wikipedia page on dog breeds offers a comprehensive list with links to individual articles for each breed.
Online veterinary care sites, such as VCA Animal Hospitals, can also provide information on dog breeds, health care and canine behavior.