Assertion: mastiff | /r/HasProperty | kept as watch dogs
Facets:
Source sentences:
text: It is probable that in the case of the larger mastiffs which were kept as watch dogs, and were bred here and there by noblemen, that there was a far more definite attempt to gain size and establish type, and to this we owe the development of the dog into the mastiff of 1800,” theorized Watson in The Dog Book.