While it isn't uncommon for a household to have both cats and dogs, we still generally identify ourselves as either "cat people" or "dog people." If you've ever had the cats versus dogs debate, perhaps you won't be surprised to learn that studies show there are marked differences in the type of person who prefers cats or prefers dogs. According to recent studies, dog people tended to be more lively, outgoing and boisterous, whereas cat people tended to be more introverted, sensitive and expedient. And who scored higher on an IQ test? That one goes to the cat lovers. However, the extroverted nature of dog people might indicate that they have higher social IQs.