Are you a cat person or a dog person? People around the world are bitterly divided about which animal is the better pet. But a new study may have found a clear winner when it comes to which animal is more intelligent: Dogs. Researchers at Vanderbilt University in the U.S. state of Tennessee recently studied the brains of several meat-eating mammals, including dogs, cats, lions, raccoons and bears. They found that dogs have many more neurons in the cerebral cortex than cats do. That area of the brain is connected to thinking, planning, and complex behavior. These are considered key to understanding an animal’s intelligence. Dogs have about 530 million cortical neurons; cats have about 250 million, the researchers found. Humans, for comparison, have 16 billion.