Jim Szatkowski wrote:

I know I've seen repellant stuff you can put on bird feeders to keep
squirrels out, but is there anything I can use to keep the cats away?
I know, a dog, a 12-guage, etc. But seriously folks.

Plant twigs in the mulch, punji-stick fashion. Cats' feet are
ticklish. They won't like walking over dozens of small, scratchy
sticks.