| Equid | Horse Name ▲ | Breed | Age | Gender | Color | Discipline | Owner |
|---|---|---|---|---|---|---|---|
| 407923B | Mt Pinatubo M | Czech Warmblood | SY23 (5yo) | Stallion | Black | EV | Manders |
| 054119C | Muad'Dib | Arabian | SY19 (9yo) | Gelding | Chestnut | EV | Morrigan |
| 326221B | Much Ado About Nothing | Thoroughbred | SY21 (7yo) | Mare | Black | CC | Rhianon |
| 437023C | Mulga Magic | Quarter Horse | SY23 (5yo) | Mare | Dunskin | SR | Jewel |
| 184212C | Munchkin McFluff | Shetland Pony | SY12 (16yo) | Stallion | Black Tobiano | PR | Lissa |
| 186512C | Munchkin McMoo | Shetland Pony | SY12 (16yo) | Mare | Grey | PR | Lissa |
| 199218B | Munin | Quarab | SY18 (10yo) | Stallion | Smoky Black Tobiano | EN | Rhianon |
| 059216S | Murcielago | Iberian Warmblood | SY16 (12yo) | Stallion | Black | WE | The Orchard |
| 154119C | Murder On The Dancefloor | Paint Horse | SY19 (9yo) | Mare | Bay Tobiano | WW | Merry |
| 360723B | MurderOnTheDancefloor | Thoroughbred | SY23 (5yo) | Mare | Chestnut | DG | Morrigan |
| 173213C | Music Man | Thoroughbred | SY13 (15yo) | Stallion | Cremello | HU | Manders |
| 108720B | Musta Made Me | Thoroughbred | SY20 (8yo) | Mare | Black Overo | FR | Lissa |
| 027612B | Mustang Sally | Thoroughbred | SY12 (16yo) | Mare | Bay Overo Sabino | EV | Lissa |
| 223521B | My Bad | Appaloosa | SY21 (7yo) | Mare | Blue Roan Blanket | SR | Lissa |
| 529728B | My Blue Halo | Thoroughbred | SY28 (0yo) | Stallion | Buckskin | FR | Morrigan |
| 238022C | My Chemical Romance | Thoroughbred | SY22 (6yo) | Mare | Bay | EV | Morrigan |
| 220921B | My Essentials | Appaloosa | SY21 (7yo) | Mare | Blue Roan Leopard | SR | Lissa |
| 046614C | My Fair Lady | American Saddlebred | SY14 (14yo) | Mare | Bay Tobiano | JP | Manders |
| 334821C | My Third Leg | Paint Horse | SY21 (7yo) | Stallion | Red Roan Overo | WW | Manders |
| 204316C | My Wish Came True | Appendix Quarter Horse | SY16 (12yo) | Mare | Palomino | WW | Jewel |
| 199013C | Myrrhder | Swedish Warmblood | SY13 (15yo) | Mare | Chestnut | DG | Izabella |
| 070618C | Myshuno | Holsteiner | SY18 (10yo) | Mare | Bay | HU | Morrigan |
| 360115C | Mysterious Ways | Thoroughbred | SY15 (13yo) | Mare | Bay | EV | Merry |
| 455921B | Mystic Dancer | Irish Cob | SY21 (7yo) | Mare | Bay Tovero | DV | Soleil |
| 187713C | Mystic Tide | Holsteiner | SY13 (15yo) | Mare | Black | EV | Lorelei |
