| Abbreviation | Definition |
|---|---|
| DDDDD | Darn Dirty Dead Dog Ditch |
| DDDR | Double Dog Dare Rescue |
| DDDU | Double Dog Dare U |
| DDLC | Dogs Den Learning Centre |
| DDTC | Dayton Dog Training Club |
| DDTD | Duck Dog Truck Decal |
| DDTF | Dangerous Dog Task Force |
| DDTW | Dead Dogs Tin Whistles |
| DED | Dog Eat Dog |
| DFAI | Dog Friendly Association of Ireland |
| DFOW | Dog Federation of Wisconsin |
| DFR | Dogs F in Rock |
| DGP | Dog Gone Pain |
| DISC | Dominance, Influence, Steadiness, and Compliance |
| DITTO | Dogs in Training Teaching Owners |
| DJ | Directed Jumping |
| DLA | Dog Leucocyte Antigens |
| DLA | Dog Leukocyte Antigen |
| DLG | Doggy Lovers Guild |
| DLH | Domestic Long-Haired |