Assertion: dog | /r/ObjectUse | used for such tasks
Facets:
value: most often
type: DEGREE
value: as tracking missing persons
type: TRANSITIVE-OBJECT
Source sentences:
text: Dogs are used for such tasks as tracking missing persons, digging underground, and tracing toxic substances, such as gases, that are undetectable by humans.
text: And although pigs have been used by truffle farmers for years to lead them to the hidden fungus, dogs are now the animal most often employed for the task.