This article is from the Mastiffs Breed FAQ, by mmcbee@access.mountain.net (Mike McBee) with numerous contributions by others.
No. Like humans, Mastiffs are individuals. Each has its own
genetic and environmental history that effects its attitude,
temperament, health and responses to stimuli. These questions are
answered with the general breed characteristics in mind, no
individual Mastiff will match the answers in every respect.
Oh, that's not what you meant. While it is correct that the breed
of mastiff dog developed in England has pre-empted the official
name of 'Mastiff', according to the AKC's 'The Complete Dog Book',
18th Edition, "The breed commonly called "Mastiff" in English
speaking countries is more properly described as the 'Old English'
Mastiff." From the same source: "The term 'mastiff' describes a
group of giant varieties of dogs rather than a single breed."
If this is what you meant, then No, not all Mastiffs are the same.
See Appendix J for a list of some of the different Mastiff
varieties.
 
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