Almost the last word.

Robert Stuart San Francisco, California, US Do dogs know that other dogs are dogs just by looking at them? " We have no way of knowing how or if a dog "recognises" another dog as being different from its owner" This week's new questions On the small side Is there a limit to how small an adult arthropod can be? The back pages Two of a kind How do dogs recognise that another animal is also a dog when there is such a vast array of canine shapes and sizes?. [Extracted from the article]