I wear a bell so the dogs hear me coming and aren't startled. If they're still adopting an aggressive posture, I try to intimidate them by opening up my jacket and appearing much bigger than I am. Also, holding a white piece of paper in front of your lower face can lend the appearance of large teeth.
If all fails and they charge, it's best to collapse into the fetal position and play dead. It's possible to outrun them if you can run down a steep pitch...they are top heavy and will tumble. Just be sure to get out of the way or be crushed by 1200 of dog!
Wait, wrong deadly animal.
Dogs? Just kick them in the head. Unless the thing is rabid I think a boot to da dome is going to change its mind about biting you. If it clamps on, go for the eyes. Rip them out of its skull. This gives you digital access to the walnut sized brain. You can pluck it right out, too, then the dog goes limp like a robot with no juice. Then you get to fight the dog owner, too. Different kill strategy there. I could tell you, but I've been sworn to secrecy by the government. Think five-point-palm-exploding-heart-technique...only adapted to the groin. Exploding gonads technique. Game Over, man.
I remember the time I had to kill a purse dog with my bare hands. Damn thing went right for my throat -- lept right out of the purse. Luckily, I snatched it right out of the air like Jerry Rice and ripped its head clean off. The bourgeois bitch watched in stunned horror as I tucked the little pieces back in her purse and helped myself to a Hamilton for my trouble.
I think you should have seized the opportunity to teach your son how to instinctively kill without remorse. A family that kills together stays together. Maybe next time.
I hope in the future Americans are thought of as a warlike, vicious people, because I bet a lot of high schools would pick "Americans" as their mascot. -Jack Handy