Dogs
- 4566
- Mastiff Club of America
- Information about the breed, rescue and health committees, frequently asked questions and the National Specialty. This is the American Kennel Club parent club for Mastiffs.
- 4567
- Mastiff Club of Colorado
- Pictures, links, code of ethics, and information. Dedicated to the health, welfare, and betterment of the breed.
- 4568
- Mastiff Club of Victoria
- Information about health and temperament, list of club activities and events, application form, and a photograph gallery. Victoria, Australia.
- 4570
- Old English Mastiff Club - UK
- Breed standard, health information, newsletter, club history, show updates, forum, and their code of ethics. United Kingdom.
- 4571
- Pacific Northwest Mastiff Fanciers
- Members primarily in Washington, Oregon, Idaho and Canada. List of club officers and board members, club history, code of ethics, rescue information, and links.
- 4574
- Celestial
- Photographs, information on health certification, showing. Puppies occasionally from health certified sires and dams. Pennsylvania, United States.
- 4575
- Davis
- Pedigrees, photographs, past litters and articles on the breed. San Antonio, Texas, United States.
- 4577
- EastWind Kennels
- Puppies and stud service. Written guarantee. Pictures. Massachusetts, United States.