blue heeler

noun2

1. •
   (Australia) A blue-coated variety of the Australian Cattle Dog breed.

   • He always has his blue heeler dog in his office tucked away under his feet or near the door. — 2007
2. •
   (Australia, slang) A police officer.

   • “Take a gander son, but be quick about it,” he said lighting a cigarette. “The blue heelers come by here and start snoopin about.” — 2008