Sebastian the labrador has made an amazing recovery after a cancerous tumour the size of a RUGBY BALL was found in its chest. The huge growth weighed 6.6lb (3kg) - a quarter of the pooch's entire body weight - and was so big it was crushing the dog's heart and lungs. Owner Dave Badkin only found out when he took six-year-old Sebastian to the vet after his pet started coughing on his daily walk in Temple Newsam Park, near Leeds. Hospital worker Dave, 54, of Leeds, said: "The vets thought it remarkable he was still alive with a tumour of that size inside him.