Hornady Critical Defense from a Kimber Micro 380. Ended an attack from a Rottweiler and two Pitbulls. They were attacking my Belgian Malinois through our gate. They were trying to pull her through the gap between the gate and the fence. One shot to the head of the Rottweiler and he was dead before he hit the ground. The pitbulls fled, but were euthanized by authorities later. $2800 in vet bills for my girl and she was never 100% after that. Best dog I've ever had.

With the RIGHT load, I trust 380, but that would me my minimum.