If you are a delivery driver, you can understand the risks posed by dogs. Mace? Muzzle is an EPA approved canine repellent that is effective, safe and humane. Great for joggers, walkers and cyclists as well. Flip top safety cap with finger grip actuator. This 17 gram canister delivers 10 one second bursts and has a maximum range of 10 feet. comes with a belt clip and a keychain.