Dog?
swop dog poo for cat poo?
You can train a dog to shit on demand. Or on anyone of your choice.
Air rifle?
terraced house with strip of soil 3 foot by 9 foot under front bay
window, no vantage point.
Build a grassy knoll. Tsk.
Orange peel?
no, peel it yourself.
Have done. And I put the peel next to my pond to keep the cats away.
Sorted.
Al.