| Abbreviation | Definition |
|---|---|
| NDTC | Northants Dog Training Club |
| NEICC | New England Institute of Canine Cosmetology |
| NFC | National Field Champion |
| NGSD | New Guinea Singing Dog |
| NJW | Novice Jumper with Weaves |
| NKC | National Kennel Club |
| NMDC | National Miniature Dashshund Club |
| NOC | Not Otherwise Classed |
| NOD | Number Of Dogs |
| NODT | Northwest Ohio Dog Trainers |
| NSD | Naughtydog System inDex |
| NSSDC | North Star Sled Dog Club |
| NT | Not Trained |
| NZDD | New Zealand Detector Dogs |
| O | In veterinary animal medical records O' , refers to owner of animal Ex: " O' checked dogs feet |
| OA | Open Agility |
| OC | Obedience Champion |
| ODAAT | One Dog At A Time |
| ODB | Old Dumb Bulldog |
| ODH | Old Dog Haven |