| Abbreviation | Definition |
|---|---|
| GAA | Golden Acres Arabians |
| GALV | Gibbon Ape Leukemia Virus |
| GANG | Great Animal Nations Gathering |
| GART | Globales ArtRegister Tagfalter |
| GATS | General Agreement on Trade in Services (of the WTO) |
| GATT | General Agreement on Tariffs and Trade (of the WTO) |
| GAVC | Guardian Angel Veterinary Care |
| GB | Green Bear |
| GB | Grizzly Bear |
| GBED | Glycogen Branching Enzyme Deficiency |
| GBH | Grizzly Bear Habitat |
| GC | Grey Cat |
| GCAS | Gibson County Animal Services |
| GCVEF | Gulf Coast Veterinary Education Foundation |
| GD | Giant Dog |
| GDBA | Guide Dogs for the Blind Association |
| GDC | (Institute for) Genetic Disease Control |
| GDC | General Dental Council, UK |
| GDC | Great Dane Club |
| GDCA | Great Dane Club of America |