American Working Terrier Association
- Encourages and promotes hunting and den trialing with Terriers.
- http://www.dirt-dog.com/awta/index.cfm

Earthdog Trials Explained
- Short description of Earthdog trials, with photos and stories of Hoover the Welsh Terrier in his own Earthdog adventures.
- http://www.dogantics.com/welshiepup/earthdog.shtml

AKC Earthdog Clubs
- A geographical listing of US clubs.
- http://www.akc.org/dic/clubs/search/club_search.cfm?action=perf&display=on

Bluegrass Working Terrier Association
- Kentucky club offers activities and information relating to working Terriers.
- http://www.hometown.aol.com/weavwood/bwta.html

Puget Sound Earthdog Club
- Club information, photos and calendar of events and trials.
- http://psearthdog.freeservers.com/