No scientific classification of the breeds of dogs is at present possible, but whilst the division already given into "sporting" and "non-sporting" is of some practical value, for descriptive purposes it is convenient to make a division into the six groups: - wolfdogs, greyhounds, spaniels, hounds, mastiffs and terriers.
Mastiffs are powerful, heavily built dogs, with short muzzles, frequently protruding lower jaws, skulls raised above the eyes, ears erect or pendulous, pendulous upper lips, short coats and thin tails.
Mastiffs are employed for fighting or as watchdogs, and for the most part are of uncertain temper and not high intelligence.
I have had many dog friends--huge mastiffs, soft-eyed spaniels, wood-wise setters and honest, homely bull terriers.
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