- American College of Veterinary Surgeons
 - Bethesda - Includes information about veterinarians who are board certified in surgery. - American Rare Breed Association
- Cheltenham - Information about showing, recognised breeds, breeders and more.
- Capital Dog Training Club of Washington, DC, Inc.
- Silver Spring - Offers classes in obedience, flyball, agility, conformation, and more.
- Capital Region Flat-Coated Retriever Club
- Serving Flat-Coat families and fans in Washington DC, Maryland, Virginia, and beyond.
- College Park Dog Park
- College Park - Located in Acredale Park, near the University of Maryland College Park campus. Open to all residents of Prince George's and Montgomery Counties.
- Farm Animal Reform Movement (FARM)
- Bethesda - Promotes rights of farm animals, vegetarianism, and environmental consciousness. Programmes include the Great American Meatout and World Farm Animals Day.
- Fidos For Freedom
- Laurel - All volunteer assistance dog training organisation, dedicated to training hearing dogs, service dogs, and therapy dogs.
- Mid-Atlantic Koi Club
- Montclair - Introduces koi keepers and water gardeners to MAKC, upcoming koi events, and koi & pond supplies dealers.
- Nest Box
- Calvert County - Maryland-based birder Arlene Ripley shares her interest in photography and natural history.
- Reston Dog Park Coalition
- Reston - Working to create and support dog parks in the area.
- Weimaraner Club of the Washington D.C. Area
- Hosts AKC shows, field trials and hunting tests, as well as WCA ratings tests.
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