Hi DinaJean,
How nice of you to make a new potty for your kitties!*** :shock:There are several things you can do to keep the cats out.** Pine cones placed on top of the mulch will stop them, citrus peels like grapefruit or lemon placed on top, thorny plant clippings, a tea spray around the perimeter made from rue will keep them away, sweet gum seed balls placed on top or place chicken wire just under the mulch.* A more expensive solution for long term problems with many different critters, including deer, is a motion activated water sprinkler called the scarecrow.* You don't have to put the yellow face stickers on if you don't like the look.* They are about $75 to $80+.
https://www.vetproducts.com.au/image...hic/inn014.jpg
There is also something called cat scat (not to be confused with the indoor scat mat) with sharp points that stick up.
http://www.gardeners.com/on/demandwa...erID=11687&SC=
I've also read that people stick plastic forks or knives into the soil like the spikes on the cat scat.
Backyardgardener, I couldn't get the link to work.
Newt
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.