oh this is terrible :evil:
i like michele`s idea of that sign, it might put them off in future, and diffinatley report it to the police.
i had this happen to my dogs about 4-5yrs ago. the nieghbours were throwing slug poison pellets over the fence for my dogs to eat when ever we were out or weren`t looking. Unfortunatley even after how careful were when we let them outside Bronwin my rotty got poisoned bady and spent a week at the vets on drips and everthing despartatley trying to get the poison out of her system and keep her from becoming even more dehydrated by the poison, The poor girl couldn`t even stand up, we really thought we were going to loose her. It was one of the worst things that`s ever happened to my dogs :cry:
these people who do it are sick and evil :evil: :evil:
The police weren`t much help, so my husband went round to the nieghbour and lets just say had a "word" with them, and it worked as they`ve never done it again!!
Hope you can find some way of protecting them, and inspecting the garden thoroughly before you let them out. but i`d really do the suggestion about the sign, it will probably put them off if they think thier being watched and that people are aware of what`s going on.
good luck, and keep us updated :D