
Those who identified themselves as "dog people" were likelier to score high in the extroversion, agreeableness and conscientiousness columns. "Cat people," on the other hand, ranked higher in both neuroticism and openness, which in the context of the study meant being creative, quirky and contemplative.
"Once you know the findings, it kind of falls into place," Gosling recently told CNN. "Agreeableness and extroversion -- dogs are companionable, they hang out, they like to be with you, they like your company, whereas cats like it for as long as they want it, and then they're off."

http://www.pawnation.com/tag/dogs+vs+cats/