Synonyms:
watchdog, guard_dog
Meaning: a dog trained to guard property
Synonyms:
watchdog
Meaning: a guardian or defender against theft or illegal practices or waste; "she is the global watchdog for human rights abuses"
Usage examples
The trap caught me and the Farmer put a collar on me and made me a watchdog.
No one but the watchdog and the swallows knew her, and they were only dumb animals and could say nothing.
Watching over this peaceful and gambolling flock of Armenian lambkins is a lone Circassian watchdog; he is of a stalwart, warlike appearance; and although wearing no arms - except a cavalry sword, a shorter broad-sword, a dragoon revolver, a two-foot horse-pistol, and a double-barrelled shot-gun slung at his back - the Armenians seem to feel perfectly safe under his protection.