Illustration of mastiff
: any of a breed of very large massive powerful smooth-coated dogs that are apricot, fawn, or brindle and are often used as guard dogs
Examples of mastiff in a Sentence
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First-round competitor Brina, for instance, is a 158-pound (71.6 kilogram) Neapolitan mastiff.
—
Jennifer Peltz, Chicago Tribune, 12 Feb. 2025
Great Danes, bulldogs, mastiffs and most other large-sized dogs usually live about 7 to 9 years, according to a Dogster article, medically reviewed by Dr. Chyrle Bonk.
—Thomas G. Moukawsher, Newsweek, 11 Feb. 2025
And there's a tiny goldfish in there, just doing his best to control this big, goofy mastiff body.
—Arika Herron, Axios, 3 Feb. 2025
The viral clip shows the mastiff puppy's courageous first steps toward befriending the Labrador—her new sibling—resulting in a moment of gentle companionship that has resonated deeply with viewers on the app.
—Michael Gfoeller and David H. Rundell, Newsweek, 15 Jan. 2025
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Jennifer Peltz, Chicago Tribune, 12 Feb. 2025
Great Danes, bulldogs, mastiffs and most other large-sized dogs usually live about 7 to 9 years, according to a Dogster article, medically reviewed by Dr. Chyrle Bonk.
—Thomas G. Moukawsher, Newsweek, 11 Feb. 2025
And there's a tiny goldfish in there, just doing his best to control this big, goofy mastiff body.
—Arika Herron, Axios, 3 Feb. 2025
The viral clip shows the mastiff puppy's courageous first steps toward befriending the Labrador—her new sibling—resulting in a moment of gentle companionship that has resonated deeply with viewers on the app.
—Michael Gfoeller and David H. Rundell, Newsweek, 15 Jan. 2025
See All Example Sentences for mastiff
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“Mastiff.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mastiff. Accessed 11 Mar. 2025.
Copy CitationKids Definition
mastiff
noun
mas·tiff
ˈmas-təf 
: any of a breed of large powerful smooth-coated dogs often used as watchdogs and guard dogs
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