What kind of bike lock should I buy for college?
That's In the United States, fire alarm operation, principle, mechinism ans all that is outlined by NFPA 72 (The National Fire Alarm Code.) I know that doesn't complete answer your question, but again, people teach entire courses on the subject, this isn't something that can just be broken down into one little yahoo answer.
I would put a sign right next to the shrub. (make it colorful so it stands out and can't be missed) I would also put a small fence around the shrub . maybe even just temporarily would help so this woman gets the picture. I would make the fence round enough so if the dog tries to pee on it anyway he won't hit his target. And if neither of those workwait until you see them comming and while they are in the act you could hit both of them with your garden hose !!!