Are the Polish Hound and the Borzoi both domestic dogs?
Borzoi The Borzoi ( , literally "fast"), also called the Russian wolfhound (Russian: Ру́сская псовая борзая ), is a breed of domestic dog ("Canis lupus familiaris"). Descended from dogs brought to Russia from central Asian countries, it is similar in shape to a greyhound, and is also a member of the sighthound family.
Police dog A police dog, known in some English-speaking countries as a "K-9" or "K9" (a homophone of "canine"), is a dog that is specifically trained to assist police and other law-enforcement personnel. Their duties include: searching for drugs and explosives, locating missing people, finding crime scene evidence, and protecting their handlers. Police dogs must remember several verbal cues and hand gestures. The most commonly used breeds are the German Shepherd, Belgian Malinois and Rottweiler.