Assertion: mastiff's dog | /r/ObjectUse | used as guard
Facets:
Source sentences:
text: Mastiff, breed of large working dog used as a guard and fighting dog in England for more than 2,000 years.
text: These dogs assisted in battle and were also used as guardians.
text: Developed from war hounds into a dog used for hunting and guarding, the Irish wolfhound is ancient and may have been brought to Ireland as far back as