Also chased two cats out of the yard -- one was about to savour a nibble of my catnip and the other one looked like it - he - was about to spray a clump of tall grass

Yesterday, I put a slate stepping stone "sill" under one of the gates because I've seen them crawl under there with some difficulty (having to flatten themselves on their bellies). So the slate will hopefully close the gap enough to keep them out... and blocked another possible access by a fence post with a couple of rocks.

These cats are used to walking across my back yard on daily basis -- there seems to be a designated feline passageway here. But this has got to stop. Yesterday, I caught another one trying to use the kid's sandbox for nefarious purposes.

I have 2 kitties of my own. But they're strictly indoor cats, with occasional SUPERVISED outdoor activity. Unfortunately, I have two neighbors that keep "adopting" strays. They do trap them and have them fixed/vaccinated, but then leave them outside. I hear that some of the cats that they feed actually belong to someone else on the next street, but come around for the freebies.

So, do you think systematically blocking their access will be sufficient? I'm seriously tempted to spring for the motion-actived water-shooter.
