A furious farmer is pleading with dog walkers to keep their pets under control after a sheep was killed in a vicious attack. Robin Bates, of Wolverton Farm near Dover, says those using a footpath on the edge of his field “must show more respect”. The 26-year-old found the sheep lying on its back and covered in blood last Tuesday morning. He is now calling on walkers to keep their dogs on leads as it is not the first time one of his flock has been attacked in the field, which sits next to Alkham Valley Road. “There were claw marks on her where she’d been pulled down to the floor and on the unde…