I don't mind being challenged... But vertically, I'm out of my league!
We had a dog that was vertically challenged and he was not a fighter. But one day my daughter was walking him and he was threatened by a rottweiler. Tippy ignored him completely until the rotty snapped at my daughter. Then Tippy went at him, grabbed his front leg, and went under him. That rolled the rotty onto his back and Tippy got on top of him and wouldn’t let him up. Tippy was about 65 pounds and took down a 120 pound rottweiler and held him at bay. Since Tippy had never been in a fight we were puzzled as to where that move came from.