| Abbreviation | Definition |
|---|---|
| JC | Junior Courser |
| JD | Junior Dog |
| JDX | Jumping Dog Excellent |
| JE | Junior Earthdog |
| JH | Junior Hunter |
| JHD | Junior Herd Dog |
| JHD | Junior Herding Dog |
| JKC | Japan Kennel Club |
| JLAD | Joys of Living Assistance Dogs |
| JM | Jumpers Master |
| JR | Jack Russell terrier |
| JRDS | Jim Rau Dog Shows |
| JRT | Jack Russell Terrier |
| JRTBA | Jack Russell Terrier Breeders Association (now Parson Russell Terrier Association of America) |
| JTDC | Jupiter Tequesta Dog Club |
| JWD | Junior Working Dog |
| JYD | Junk Yard Dog |
| JYD | Junkyard Dog |
| KBD | Karelian Bear Dog |
| KCA | Keeshond Club of America |