| Abbreviation | Definition |
|---|---|
| ODSD | Ohio Disaster Search Dogs |
| ODTC | Oakland Dog Training Club |
| ODTC | Oriole Dog Training Club |
| ODTC | Orlando Dog Training Club |
| OES | Old English Sheepdog |
| OFA | Orthopedic Foundation for Animals |
| OJW | Open Jumper with Weaves |
| OTA | Obedience Trials Association |
| OTAT | One Tail at a Time |
| OTCh | Obedience Trial Champion |
| OTD | Open Trial Dog |
| PACE | Performance Agility Club of Edmonton |
| PAFTA | Palo Alto Foothills Tracking Association |
| PAKC | Prescott Arizona Kennel Club |
| PAWD | Professional And Working Dog |
| PB | Pure Bred |
| PBGV | Petit Basset Griffon Vendeen |
| PBGV | Petite Basset Griffon Vendeen |
| PC | Pet Chihuahua |
| PD | Police Dog |