The breed was used to control rodents. It is one of the source breeds of the more popular, and similar, Brussels Griffon. The Affenpinscher is a bright, alert little dog, very much a miniature terrier in conformation and temperament. The Affenpinscher was recognized by the United Kennel Club in 1957. The total, overall appearance of the Affenpinscher is to be considered more important than any individual characteristic.
Body proportions give a square appearance.
The height, measured at the withers, is approximately the same as the body length, measured from the point of the shoulder to the point of the buttocks. Bitches may be slightly longer. The Affenpinscher is not delicate in any way, being sturdy and compact, with medium bone. The breed is game, alert and inquisitive, displaying great loyalty and affection toward master and friends. The head is carries confidently upright and is in proportion to the body.