The Affenpinscher is a small, active dog breed that is known for its playful and mischievous personality. They have a long, wiry coat that is usually black, gray, or tan in color. They are loyal and devoted to their owners and make excellent watchdogs
From Wikipedia
The Affenpinscher is a German breed of small toy dog of Pinscher type. It was formerly kept as a farm or stable dog to catch mice and rats; in the twenty-first century it is commonly kept as a companion animal.