We have lived here 10 years, my neighbour was already here. He lives alone (in his mid 50's i think) Now up until this year i've never noticed him having a problem with my cat who goes in his garden (which is basically overgrown grass and a few weedy trees at the bottom). A few weeks ago i caught him squirting my cat with a water pistol...this i'm totally not bothered about. But the past few weeks he has been putting a bowl of water on his steps, but surely if he wants to discourage the cat coming in he shouldn't do this? I dont think its for the birds (its just a pyrex mixing bowl) as if it was it'd be better off in the middle of the garden.
Let me state that my cat does not use his garden as a toilet as she does this in our garden