| Abbreviation | Definition |
|---|---|
| LRR | Labrador Retriever Rescue, Incorporated |
| LRRO | Labrador Retriever Rescue Ontario (Canada) |
| LSAC | Lone Star Akita Club |
| LVTD | Lehigh Valley Therapy Dogs |
| LWDR | Little White Dog Rescue |
| MAD | Master Agility Dog |
| MAD | Mechanically Assisted Dog |
| MADC | Master Agility Dog of Canada |
| MAPR | Mid Atlantic Pug Rescue |
| MAS | Miniature Australian Shepherd or Miniature American Shepherd |
| MBBD | My Beautiful Black Dog |
| MCWC | Mastiff Club of Western Canada |
| MDD | Marijuana Detection Dog |
| MDDB | Malaysian Dogs Deserve Better |
| MDGM | Mine Dog Gold Mine |
| MDKB | My Dogs Killed Batman |
| MDMC | Mad Dog Motorcycle Club |
| MDT | My Dog Tess |
| ME | Master Earthdog |
| METER | Massive Eating Trick Epic Rape |