Definitions for guard dog
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Random House Webster's College Dictionary
guard′ dog`(n.)
or guard′dog`
a large aggressive dog trained to guard persons or property; watchdog.
Category: Dogs, Cats, and Horses
Princeton's WordNet
watchdog, guard dog(noun)
a dog trained to guard property
Wiktionary
guard dog(Noun)
A dog used to protect a property or its owner.
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