Mastiff breeds

Latest coverage of this topic All breeds

Sporting Group 33
Hound Group 33
Working Group 32
Terrier Group 32
Toy Group 22
Non-Sporting Group 20
Herding Group 33

#	Breed	AKC group	Size	Weight	Lifespan
40	MastiffThe Mastiff is one of the heaviest dog breeds, a massive but gentle English guardian with a calm manner and a short, easy coat.	Working Group	Large	120 to 230 lb	6 to 10 years

Ranked by the American Kennel Club's 2025 registration popularity. The three breeds it recognized in January 2026 follow. Weights are typical adult ranges; sizes are this site's classes: small under 25 lb, medium 25 to 60 lb, large over 60 lb.