I've heard that tossing moth balls around in the garden where the cats like to go makes them think twice about using that spot.Just been out to check on my frogs (a second one has joined the first in my 'pond').
I've set up my wildlife camera again to watch them but it's mainly filming next doors cats.
Wish I knew how to get rid of them - the electronic cat deterrent doesn't seem to make any difference.
if we weren't short of water I'd get a motion detector water hose.
Apologies to cat lovers but I don't like them using my garden as a giant litter tray!!