My opposable thumbs!
I know I can handle two dobermans and a collie-like-thing with just a jacket, a pair of sturdy hiking boots and the above-mentioned thumbs.

Confronted with more and/or bigger dogs I might have to change tactics.
Most people are more afraid of dogs than they need to be. Even wild ones. The average, able-bodied adult male is bigger, stronger, heavier, has more reach, has (inch-for-inch) more powerful jaws, has bigger and (when shod) harder feet, and has the supreme ability to grasp and manipulate objects. These objects may be throats, mandibular joints and legs for twisting or hard, heavy and sharp things for swinging. Bottom line: You are physically more than a match for any dog that doesn't outweigh you.
But that only matters when the numbers are fairly even. If set upon by a pack of a half dozen or more, your inherent physical advantages diminish greatly. Now is when your mental advantages must save you.
PROTECT YOUR THROAT! That is how dogs kill after the pack has pulled down the quarry.
IF YOU HAVE ANY WEAPON, USE IT. A knife of any size, a flashlight, walking stick, canteen or even your belt. Your shoes are clubs on your feet. Pick up a stick or rock or even the smallest dog and start swinging.
FOCUS ON ONE DOG AT A TIME. As long as you protect your face and throat, let the others chew to their hearts content on your calves and elbows and butt. You'll deal with them presently. Pick the BIGGEST dog first and KILL it. Odds are this is the Alpha. You won't have time to observe group dynamics in the pack to know for sure, so play the odds. Move on to the next biggest, and the next until the attack is over.
IGNORE YOUR WOUNDS. Tending your wounds or trying to protect anything except an artery during the attack will only make it terminal. You are fighting for your life. Fortunately, you are fully equipped to win that fight.
I guess my point is; Anything you may have in hand would be helpful, but what you have in your head is what will make the difference.