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Thank you for very much for your suggestions, we will visit our local pet shop today to look at all the alternatives you mention. I actually sprinkled loads of dustbin powder around the gates last night & I thought that as it's white, the irresponsible dog owners may take the hint! Also, the they only seem to venture out late at night, or very early in the morning, so there's not much chance of catching them. But believe me when I do, they will certainly get a mouthful from me! Cheers pepes.