I live in a city where the bylaw ordinancestates that cats are to be kept either indoors at all times, or on aleash. However, this ordinance has been ignored by a majority of catowners ever since it was put into place. Personally, I am one of thosepeople who has a cat who goes outdoors. (Actually I have two cats, onewho goes outdoors and one who is strictly an indoor cat.) Fritz, thecat who goes outside, was previously owned by someone who let him gooutdoors more than he was allowed inside. After I adopted him(ironically, because he was hit by a car and the owners abandoned him),I attempted to turn him into an indoor cat. No such luck. If he didn'tget his way and go outdoors, he cried constantly, clawed at the door,urinated in corners and/or on the door, furniture, etc. until I finallyrelented and let him out (after attempts to harness him outdoors, whichalso failed). He now has been with me for almost nine years, and (sofar) haven't had any complaints from neighbours. Actually, over half ofthe people on my street own cats, and they all go outdoors as well.
I did have a problem with one neighbour's cat for a brief time...hediscovered that I have rabbits, and he began stalking them. FortunatelyI also own a dog, and if I have to go in the house while the rabbitsare loose in the backyard, the dog stays outside with them. She chasesaway any cats, squirrels, raccoons, etc., and alerts me when there issomething wrong.When this neighbour's cat showed upa few weeks ago, Kaya began barking like mad a couple of minutes afterI'd gone into the kitchen, so I ran to the door to see what was wrong.Her fur was raised and she was going nutz, running back and forth fromthe door to the side fence (that's her way of saying to me, "MOM!!!COME QUICK!!! LOOKIT THIS!!!"). So I followed her to the fence andthere, sitting on the other side, was the biggest, meanest, orneriestcat I'd ever seen. Kaya ran up to the fence and began barking wildly atthis Catzilla, but hesimply hissed and (literally) attackedthe fence, claws out and fangs bared. So I shooed Kaya away andapproached, and the cat then went after me...lol...I had to run! He'dspotted the rabbits apparently, and was planning an attack when Kayathwarted him. Kaya isn't a small dog (she weighs upwards of 50 lbs) andshe scares off just about everything, but she knew enough to keep herdistance from this brawler. However, her presence did keep him fromdoing any harm.
Anyway, for the most part I have the best defense system against a cator any other animal (including humans) who might wander into the yardwhen the bunnies are out, but if I didn't have Kaya I would recommendtargeting roving pests with a blast of the garden hose...set on fullwith a good strong spray nozzle. It won't hurt the animal, butcertainly will deter them. Without my dog though, I wouldn't leave therabbits unsupervised for any length of time, as newpredatorscan show up and do damage very quickly.