Dog are dangerous if, trained to be so or if, left to run wild the wolf is still in the blood of these beast. The havoc they can cause is legendary. Cry ‘Havoc,’ and let slip the dogs of war;That this foul deed shall smell above the earth
With carrion men, groaning for burial. Is a famous quote about such destruction. So either wild or on some sick bastards command you may have to deal with a dog or pack of dogs. Whatever you do do it quick and do it vicious so as to put the others off.
I have been bitten before and I can tell you that keeping calm and measuring your response is important. I managed to keep my fear in check and escape with minor injury.