Mid-Levels residents fear a mystery dog baiter has returned with a vengeance after several dogs were poisoned along Black's Link and Bowen Road. On Sunday a Rottweiler died, and a golden retriever is in critical condition, after eating bones baited with an unusually strong dose of poison. Owner of 31/2-year-old Trillian, Audrey Westley said: 'She is critical, there is a 70 per cent chance she is going to die. The vet said in the past poisoned dogs have survived so not to worry. This time the poison is so strong. Old chicken bones and barbecued pork - they really smelt of pesticide.' Mrs Westley, who collected the baited bones for analysis, said: 'I would like all dog owners to be warned.' Hong Kong Veterinary Centre vet, Dr Lloyd Kenda said the strength of poison would be enough to kill a small dog instantly. 'The poison is much much worse than last time. It seems to be stronger or a different type,' he said. Happy Valley Acting divisional Commander Mark Ma Kwok-wah said the poisoning was the third case this year, following an incident in April, and surprise patrols would be sent to the area.