Honestly I think some of you are a bunch of sick fucks. How can you contemplate killing an innocent animal that is someone else's pet, that some child loves.
Nevermind that may not be the one using your garden as a toilet. I have hedgehog poop all over my garden, I thought it was cats for a long time. There's also foxes and the birds make a huge mess under the lamppost.
Whats also shocking is that some of you would rather have poison in your garden, is this not infinitely more dangerous than poo. Oh and Ha Ha Ha, thats hilarious joke about kicking a cat and hearing a satisfying thud.
My cat uses an indoor litter but goes out and ventures around the neighbouring gardens. She was an indoor cat but started to get ill from stress which was cured by letting her out.
My friend recently witnessed a cat on the street being ripped to bits by a dog that wasn't on a leash, do you lot think thats what the cat deserved? What the hell are you teaching your kids, it's okay to kill someone else's pet and it's okay to hurt animals?
The OP has 15 cats next door, thats ridiculous and I'm sure the poo is a problem. The owners should be reported, that many cats is an environmental hazard. One cat (if it is a cat, could be foxes, weasels, hedgehogs, etc) is no reason to go out slaughtering.
OP have you tried this - www.greenfingers.com/superstore/product.asp?dept_id=2235&pf_id=DD1099D&source=webgains&siteid=39408 it's drastic but I have friends who use them and they work.