Small - Tahltan Bear Dog - 15 pounds.
http://www.thebreedsofdogs.com/TAHLTAN_BEAR_DOG.htm
Cougars right tick me off. They sound like a baby crying in distress in the bush. If you've got one hanging around it can be hard to sleep at night. I've got occasional cougars, black bears, grizzly bears, and wolves but have never had any sort of problem. Two legged beasts are a lot more worrisome than the four legged variety. Besides I take the odd shot at a bear to coax them on their way. You can't do that with the two legged variety.