Dog personalities can shift just like those of humans, study says

We like to imagine that all dogs are good dogs -- and the vast majority of them never give us a reason to question that belief -- but just how good they are is something that can change over time. A new study suggests that canine personalities aren't set in stone and, just like humans, they can go through dramatic personality changes based on life events. The research, which was published in Journal of Research in Personality, is the largest study of dog personality ever conducted. Over 1,600 do...