There is also Halt II. Here is a blurb:

Halt II dog repellent has stopped attacking dogs since 1966 for the U.S. postal service and many public utility meter readers. Halt II has 285% more effective stopping ingredient than standard halt. Halt causes temporary discomfort to the attacking dog when sprayed in the face, giving you time to retreat to a safe distance.

I bought it from: http://www.omarksafety.com/category....=1&aprodid=148