The doggie mace is made to work on dogs with muzzles (not pugs though) and it is a kinder formula that is not as powerful as human pepper sprays. This info we received from Humane Society and animal control officers, who say yes it does work on dogs with muzzles.
A lot of people really like dogs but need some deterrent while running.
Other pepper sprays are also made with ease-of-carrying while running or bike riding in mind. The MSI jogger and MSI MUZZLE K9 DOG REPELLENT are very popular items that runners buy a lot of.