Definition that contains guard dog
- mastiff an old breed of powerful deep-chested smooth-coated dog used chiefly as a watchdog and guard dog
- schnauzer old German breed of sturdy black or greyish wire-haired terriers having a blunt muzzle ranging in size from fairly small to very large; used as ratters and guard dogs or police dogs
- komondor Hungarian breed of large powerful shaggy-coated white dog; used also as guard dog