I had a miniature dachshund (12 pounds) and a boxer/pitbull mix (70 pounds). The dachshund was the oldest and therefore the boss. On two different occasions, my brother brought home cuttings from the meat room- 10#s or so- more than both could eat combined. Both times, the dachshund, "Brandy,"snapped at the bigger dog, "Bo". Bo responded the first time by picking Brandy up by his neck and the second time he lifted him by his rib cage. Puncture marks both times but no real damage. A whole lot of fight in the little dog...he never did back down...or learn.
Here's the two scoundrels when Bo was about a year old. Best looking dog I ever owned.