It's not the size of the dog in the fight, it's the size of the fight in the dog...or something like that.
It also helps that there is a door between the dog and the mountain lion.
FACE OFF: A fearless dog named Dash didn't back down when a mountain lion walked up to his home in Grand Lake, Colorado. The two animals had a stare down that left Dash's owner shaken. pic.twitter.com/8ZYnDuoij3
— CBS News (@CBSNews) December 6, 2021