Everybody loves dogs, but we want to stay safe against aggressive ones, which is why dog mace was first created. Mail carriers use and trust dog mace as it keeps them safe every time they have to use it. It causes no harm to the dog, just temporary discomfort.
We also have an UltraSonic Dog Chaser, which you can see below, however it will only work against dogs. As dog mace works against other aggressive animals, this dog chaser device may not.