Assertion: dog's pup | /r/HasProperty | removed at 10 days of age
Facets:
value: from the den
type: LOCATION
Source sentences:
text: To create a socialized wolf the pups are removed from the den at 10 days of age, kept in constant human contact until they are 4 weeks old when they begin to bite their sleeping human companions, then spend only their waking hours in the presence of humans.