First off if you are attacked by a pack of dogs/wolves make sure you are up a strong tree and stay there and call for help. No martial art can help you against being attacked by packs of wild animals. Unfortunately in real life creatures/people do not each attack in turn so it is not like in movies where you can first fight one then the other opponent. So get up a tree or get yourself in a corner, or some palce you can (a) avoid the fight or failing that (b) only need to fight against one opponent at a time.
Fighting a rabid canine or a well trained "fighting" dog will be pretty much the same. At least with one animal you can focus on it. Unarmed is always risky and being bitten is bad, but always keep your more crucial areas well protected, a bite in the arm or leg would be better than the throat, face or groin.
Wrap your jacket or sleeves around your weaker arm so you can use it as something for the animal to take, use the other hand to attack the animal. I would go for crushing the throat as soon as possible and if I can get the animal down i would use my body weight to hold the animal down. But here it can be very difficult as you have a strong fit opponent with sharp teeth, and it will basically be fearless if rabid or well trained.
As slugster said there will actually be a lot of better things to do than attack, so try looking for things on animal behavior and controlling animals.