(not OP, have regular robo mower) Animals are no problem, they get out of the way themselves. Children leaving toys out (or socks), or branches that have been blown off trees, or chestnuts - those make for some scary noises.

I'm no expert, but Cats and Squirrels would be pretty good at hearing and seeing danger, even feeling vibrations nearby. I doubt they'd get caught by a lawn mower at walking speed.

I’ve mowed (personally and as a summer job when younger) for almost 40 years. Animals of all sorts seem to avoid the mower when already runnng.

As a kid, I gave our family cat a close scalping. It was late fall and we were picking up leaves with the mower. After a lunch break, I fired up the mower and the cat shot out from underneath making an awful noise and headed for the woods.

We assumed she was fatally injured until two/three days later when she came walking back up the sidewalk, sporting a close shave on one part of her head, but otherwise seeming uninjured. She got plenty of her favorite food that day!

I would like a tutorial on how to make one that can chop up the neighbor's cat please.