The Brussels Griffon and Affenpinscher are visually similar but have a few key differences, including their temperament and ancestry. A Brussels Griffon is highly emotional and attached to its owner, becoming assertive and aggressive when they feel threatened. In contrast, an Affenpinscher is a more emotionally stable breed that works well as a watchdog. The origins of the breeds are the best summary of their differences. People bred the Affenpinscher to hunt rodents. On the other hand, the Griffon is a mix of Pug, Affenpinscher, and Toy Spaniel ancestry. Originally meant as a ratting dogs, Brussels Griffons now take the role of house dogs.