The correct name of this breed is simply "Mastiff", though it is sometimes referred to as "English Mastiff" or, less correctly, "Old English Mastiff". There are many other Mastiff-type or "Molosser" breeds that are often confused with (or inaccurately reported as) the Mastiff but which are separate and distinct breeds.
First- let's start with what are NOT Mastiffs. A few of the breeds often confused with the Mastiff are the Bullmastiff, Cane Corso, Dogue de Bordeaux, Fila Brasileiro,Neapolitan Mastiff, Presa Canario, Tibetan Mastiff, and many others which fall into the larger category of "Molosser” breeds. These dogs are not Mastiffs. Each is a separate and distinct breed. SSMF is dedicated to protecting the welfare of the true Mastiff breed only.
This classic photo above of two Mastiffs 'at work' are old SSMF Mastiff Calendar Contest Winners. The Mastiffs in the picture are now over the rainbow bridge. Bonnie Blink's Hermes & Jennifer Lambden's Bree.
Read the history of Mastiffs from the link above to the Mastiff Club Of America website.
Mastiffs are an ancient and noble breed. They are known as 'castle keepers' from time immemorial and classified by the AKC as a Working Breed. Mastiffs are prized for their 'grandeur and good nature' which is taken from the AKC breed standard for Mastiffs. Mastiffs come in the following colors.
The picture of the carting Mastiffs above depict both a fawn and an apricot
Fawn (always with black mask)
Apricot - (various shades of red)
(can be fawn brindle or apricot brindle)