I had a neighbor with a dog that was always trying to get through a hole in the fence, so I'd always carry when mowing. Half his head was through, always snarling and growling at me as I went past. Weedeating was always fun at that area, trying to go around that spot until one day I said f**k that and kept weedeating that spot. Dog didnt seem to like having his face weedeated, and he quit that aggressiveness towards me.