N THE age-old war between cats and dogs, canines might just have struck the killer blow. A border collie called Chaser has been taught the names of 1022 items - more than any other animal. She can also categorise them according to function and shape, something children learn to do around the age of 3. Chaser follows in the footsteps of Rico, who trained at the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany. Rico had a "vocabulary" of 200 words and could identify new objects in a group of familiar objects by a process of elimination, according to...