The pets are among many small animals that have been attacked after startling the snakes as they bask in the sunshine and had to be put down as the venom ravaged their organs. Two dogs have died after being bitten by poisonous adders that are out in unusually large numbers because of the hot weather. Dog owners are now being warned to be on their guard to prevent any more deaths from the species, which is found throughout the Britain Isles.he latest victim was a ten-year-old King Charles Spaniel which was bitten as she played in a back garden in Canvey Island, Essex. Daisy-May was being looked after by Carol Toplis, 57, while her owner was in hospital for a knee operation.'It was really nasty. The venom attacked her organs. She became very sleepy, it was as though she'd had major surgery,' said Mrs Toplis. The whole story and phots are at Mail On-line.Labels: dogs, envenomation, Vipera berus