My neighbours cat was poisoned by Anti Freeze, Cats have a fondness for drinking stagnant water even if they have fresh at home so it is a huge worry.
He believed it was deliberate by a neighbourhood cat hater.
I think perhaps flyposting the penalties for being caught poisoning a household pet may help, along with a reminder that many gardens have movement triggered lighting and possibly CCTV which would be passed to the police.
Perhaps speak to the safer neighbourhood team about it?
I'm a bit frantic about this but clueless as to how to stop it...short of catching the perpetrator and sticking them in stocks at FH station