I've got some beds that I maintain for one of my customers. There is a dog on the property next to the one that I maintain. The dog comes running over to me , under a split rail fence, growling and barking. This has happened twice. The dogs owner says "don't worry, he won't hurt you". But whats going to happn the day the owner isn't there to call the dog back. I'm thinking of getting some mace or pepper spray. Any "civil" ideas?