A breed of dog used for guarding sheep.
A breed of dog, used for herding sheep.
A police officer.
To chaperon or shepherd.
A guard dog.
An individual or group that monitors the activities of another entity (such as an individual, corporation, non-profit group, or governmental organization) on behalf of the public to ensure that entity does not behave illegally or unethically.
To perform a function analogous to that of a watchdog; to guard and warn.
To be continuously reset by a watchdog timer.