The Affenpinscher and the Pug can both be territorial and very yappy when strangers approach. When looking for ways to keep your dog active, you may want to avoid dog parks that have larger dogs. Larger dogs may take exception to a small dog thinking he rules the world. Long walks around the neighborhood or even playing in a large fenced backyard are great ways to keep him moving. This dog will require at least 30 minutes of hard play to wear him out. Dog sports such as agility or even rally would be a great way to bond with your dog and keep him active.