| Abbreviation | Definition |
|---|---|
| MFDC | Mid-Florida Dalmatian Club |
| MH | Master Hunter |
| MHAD | Mental Health Assistance Dogs |
| MHR | Master Hunting Retriever |
| MKC | Mandaluyong Kennel Club |
| MLDD | Main Line Deputy Dog |
| MLDR | Multi Limit Dog Rail |
| MMBC | Minnesota Mixed Breed Club |
| MNDB | Muddy Nose Dog Biscuits |
| MPCNC | Miniature Pinscher Club of Northern California |
| MSCA | Maremma Sheepdog Club of America |
| MSDA | Michigan Sporting Dog Association |
| MSSDA | Midsouth Stock Dog Association |
| MWD | Master Working Dog |
| MWDT | Military Working Dog Team |
| MWH | Miniature Wire-haired |
| MX | Master Agility Excellent |
| MXJ | Master eXcellent Jumper |
| NA | Novice Agility |
| NACM | NACA (National Animal Care Control Association) Courser of Merit |