How to Repel Cats From Your Yard
You don't have to have a problem with cats to have a problem with them using your garden as a litter box, or them using the hood of your car as a lounge chair. In fact, you might even be the owner of the cat who's causing you problems. Whatever the situation, the following tips will help you to safely (and humanely) repel cats from your yard.
Mulch with Poky Materials
Replace your bark mulch with pine cones, holly leaves, rose clippings or rock chips. They don't feel good underfoot, and will encourage cats to spend their time elsewhere. If you'd like to keep your bark mulch, just add a thin layer of the previously mentioned materials on top (egg shells work well, too, and they're an excellent fertilizer).
Trying to keep cats off your car? Drape a spiky plastic door mat or runner on the hood when you park, until you've broken them of the habit of sitting there.
Fill in the bare spots in your garden with more plants, decorative rocks or garden statuary. Exposed soil is just begging to be used as a litter box. Have certain spots in your yard that have become the bathroom spot of choice? Lay down a piece of chicken wire or a spiky plastic doormat. They won't do cats any harm, but they won't feel good to walk on, either.
Clean up any brush piles and clutter in your yard; cats will see them as the perfect place to hunt mice. Then, make sure all of your bird feeders and bird houses are too high for cats to get to easily.
Unmark Their Territory
Dealing with a neighborhood cat who insists on marking your doors as his territory? Reverse the behavior by giving your doors a thorough cleaning each and every time he does it. An enzyme cleaner will remove all traces of his markings, so he's less likely to come back and re-mark his territory again (cats re-mark any spot that they can smell their odor on)
Remove Sources of Shelter
Make sure feral cats aren't sheltering in your yard by securing your shed and any other outdoor buildings that they may be able to get into. If you have a crawl space under your porch or your house, also make sure these areas are secured. Work with animal control or your local no-kill shelter to trap, spay/neuter and release the feral cats in your neighborhood. This will prevent a population boom, and should minimize spraying, especially if you have them fixed, while they're young.