| Abbreviation | Definition |
|---|---|
| GAC | Grand American Championship |
| GAP | Greyhound Adoption Program |
| GATD | Gone are the Dogs |
| GCMO | Greyhound Companions of Missouri |
| GD | Great Dane |
| GD | Guard Dog |
| GDAV | Guide Dog Association of Victoria |
| GDCA | Great Dane Club of America |
| GDFB | Guide Dog Foundation For the Blind |
| GDRT | Guide Dog Ray Tracing |
| GDUF | Guide Dog Users of Florida |
| GFCH | Georgia Federation of Coon Hunters |
| GHAD | Guide hearing and assistance dogs |
| GHD | Galactic Hot Dogs |
| GLDR | Great Lakes Dog Rescue |
| GLWR | Great Lakes Weimaraner Rescue |
| GLWR | Greyhound and Lurcher Welfare Rescue |
| GM | Gambler Master |
| GMHR | Grand Master Hunting Retriever |
| GOBR | Greater Ohio Boxer Rescue |