WASHINGTON (AP).- Surprised scientists have discovered the remains of a saber-toothed vegetarian. The leaf-crunching animal — about the size of a large dog — lived 260 million years ago in what is now Brazil, researchers report in Friday’s edition of the journal Science. Its upper canine teeth were nearly 5 inches long. Such large teeth are more often the mark of a meat-eating animal, used to capture and kill prey. The enormous canines were likely used by the plant-eating animals to fight each other or protect against predators, said research leader Juan Carlos Cisneros of the University of Piaui in northeastern Brazil. For example, they might have fought for territory, resources or females, like the modern musk deer, which also have a pair of large, tusklike teeth, he said via email. “These situations are extremely