Assertion: mastiff's dog | /r/HasProperty | socialized by owner
Facets:
value: from a very early age
type: TEMPORAL
Source sentences:
text: They are prone to pulling and chewing on just about anything, as well as to being very protective, so it is essential that any dog from this breed is meticulously trained and socialized by a knowledgeable and experienced trainer or owner from a very early age.