Magyar Agar 

Mahratta Greyhound 

Majestic Tree Hound 

Majorca Shepherd Dog 

Malchi

Mal-Shi

Malinois X

Malteagle

Maltese

Malti-Pin

Malti-Poo

Malti-Pug

Maltipom

Malton

Manchester Terrier

Maremma Sheepdog

Markiesje

Mastador

Masti-Bull

Mastiff

Mauxie

Mauzer

McNab

Meagle

Mexican Hairless (See Xoloitzcuintle)

Mi-Ki

Middle Asian Ovtcharka (See Central Asian Ovtcharka)

Mini Australian Shepterrier

Mini Coonhound

Mini St. Bernard

Miniature American Eskimo (See American Eskimo Dog)

Miniature Aussiedoodle

Miniature Australian Bulldog

Miniature Australian Shepherd

Miniature Bull Terrier (See Bull Terrier)

Miniature Bulldog

Miniature English Bulldog

Miniature Fox Terrier

Miniature Goldendoodle

Miniature Labradoodle

Miniature Pinscher

Miniature Poodle

Miniature Schnaupin

Miniature Schnauzer

Miniature Schnauzzie

Miniature Schnoxie

Miniboz

Minnie Jack

Mioritic Sheepdog

Mongrel (Mutt)

Moscow Toy Terrier (See Russian Toy Terrier)

Moscow Vodolaz 

Moscow Watchdog

Mountain Cur

Mountain Feist

Mountain Mastiff

Mountain View Cur

Mucuchies

Mudi

Muggin

Münsterländer