Daisy one pump is all you need. Any time he comes around, pop him one in the rear. Make sure you shake the Daisy every time. After a while, you should not see the dog and if you do, you can just shake the little bb can and he will book it out of there. Works well for barkers too. Shake the can and they shut up quick. It bounces right off so it's nothing too bad. It does get their attention though.