your making a statement there pal,corrected at time and some effort put into it WOULD have cured it. ive 32 years of running lurchers,and whilst i dont claim to be ceaser milan.i have never had a sheep worrier,apart from my last dog,he was well CORRECTED but a good while later and no end of back to basics and endless free walking through the wooly backs ,he did it again,dont wish an arguement ,but it sometimes just happens.even on one man and his dog about 15 years ago.atb Benny