Posted: 12/08/2008 - WASHINGTON (AP) -- No fair! What parent hasn't heard that from a child who thinks another youngster got more of something? Well, it turns out dogs can react the same way. Ask them to do a trick and they'll give it a try. For a reward, sausage say, they'll happily keep at it. But if one dog gets no reward, and then sees another get sausage for doing the same trick, just try to get the first one to do it again. Indeed, he may even turn away and refuse to look at you.