History of the Mastiff? ~ Fluffy?
Over the past few centuries the Old English Mastiff, now known as the Mastiff, has been perfected from crossbreeding to several breeds of molloser type dogs – all being dogs of the working class.  This may have been done for a variety of reasons, including, but not limited to, – necessity (to resuscitate a dying breed), geography, lack of compatible regional breeding stock, and, in some cases, ignorance.

Regardless of why it was done, the combination of all the breeds mixed into this great breed has created the Mastiff as we know and love him today.  All Mastiffs, of the old English variety, share a common gene pool; the majority of which can be linked directly to a handful of dogs.  The studbooks, which were hand written back in the 1800s, show that many of our ancestral Mastiffs all go back to one particularly small gene pool.  In the beginning, this would include Lukey’s Governor, for whom the standard was written to reflect in 1867.

Below is an etching of Lukey’s Governor and his pedigree…

As you can see from his pedigree above, not much was known about his sire's side of the tree, but the dam's side is very interesting if you go back and look at the lineage closely.
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Lukey's Bruce II ( Grandfather & Great-great Grandfather) above - he is listed as a 'blue brindle'.
Hertford's Pluto ( Great-great Grandfather) above - he is listed as a ' black rough coated Tibetan Mastiff'.
And, just for fun, below is the pedigree for Thompsons’ Juno, Lukey's Great-Grandmother...

She was a fluffy mastiff born in 1830.  The notations made say "massive, long, shaggy".  Proof, as far as a documented pedigree goes, that fluffy Mastiffs were around PRIOR to both the claim that fluffies happened as a result of 'reviving' the breed post world wars AND prior to a certain New Jersey breeder monkeying around with the gene pool ;)
Waterton's Tiger, who is also related (it gets kinda sticky when you see all the in-breeding and linebreeding - I counted at least 5 'greats' to this one) to the Lukey kid.  It seems that Thompson's Duchess' great, great-Grandmom (Crabtree's Dorah) goes back to a male on her dams side by the name of 'Waterton's Tiger (pedigree above).  Turns out he is an Irish import Great Dane with a cropped tail - or possibly a Boarhound.
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So, what does all this mean?  Well, since antiquity – at least as far back as the pedigrees are able to tell us - ‘fluffy’ mastiffs were and are part of the Mastiff breed – long before the standards were written by ANY country for the Old English Mastiff.
**     The above info was garnered from the Devine farms pedigree program created by Deb Jones and offered thru the Mastiff Club of America Rescue, for a nominal donation.  Some of this information was also taken from Elizabeth (Betty) Baxter, respected mastiff breeder, author, and international Mastiff judge.