answered 4/27/2009 My Dog Has Blood In His Stool.he Also Has Red Eyes And He Is Becoming Very Aggressive.he Also Has Been Loosing Strength In Both Legs And His Back.any Ideas? My dog had bloody stools,we took him to the vets as he became weak not eating&drinking.he had a tumour in his bowels which had burst.he was only 3years old.please take your dog straight to the vet.