Have to agree with Machias. I do skunk removal on the side and if you want to avoid catching cats, use something other than fish related baits. Sardines, tuna, etc. will catch a lot of cats. Vanilla wafers, marshmallows, peanut butter are better options for keeping your target animal narrowed to skunks. However if you have a lot of squirrels in the immediate area I'm told they might go for the peanut butter too. I've never had that problem though.
Good luck!