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
Recent Examples on the Web
Deebo weighs 115 pounds and is a mix of American pit bull, St. Bernard, Great Dane and mastiff, Pitlanish said.
—
Eric D. Lawrence, USA Today, 12 Aug. 2025
His 150-pound Pitbull mastiff needs to be housed somewhere.
—Emily Temple
may 27, Literary Hub, 27 May 2025
The couple had left their two mastiffs, Drago and Lita, at home with a pet sitter.
—Lauren Penington, Denver Post, 19 May 2025
Bear the mastiff and Staffordshire bull terrier mix simply loves playing fetch and chasing after his toys outside.
—Alyce Collins, MSNBC Newsweek, 20 June 2025
See All Example Sentences for mastiff
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Eric D. Lawrence, USA Today, 12 Aug. 2025
His 150-pound Pitbull mastiff needs to be housed somewhere.
—Emily Temple
may 27, Literary Hub, 27 May 2025
The couple had left their two mastiffs, Drago and Lita, at home with a pet sitter.
—Lauren Penington, Denver Post, 19 May 2025
Bear the mastiff and Staffordshire bull terrier mix simply loves playing fetch and chasing after his toys outside.
—Alyce Collins, MSNBC Newsweek, 20 June 2025
See All Example Sentences for mastiff
Cite this Entry
“Mastiff.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mastiff. Accessed 21 Aug. 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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