Never really had a dog problem. I like dogs and generally am able to either bond with them in some capacity or just tell them to back off and things turn out ok.

The goal should be to get away from the dog without harm to the dog. A loud whistle can do the trick as could maybe a water bottle spray. Pepper spray is generally a horrible idea and isn't always legal everywhere and for most people isn't safe unless you know how to use it properly and responsibly.