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Ask a cat lover and a dog lover which species is smarter and you'll get two different answers.
As a dog lover myself, you can guess my opinion, though what do I know, apparently a study in the United Kingdom found that the average cat lover holds a higher education  than the canine persuasion! But, smarts aside, the truth is that dogs have larger brains, and not because they’re generally bigger.
A new study by Oxford University shows that canines have larger brains  than felines because they are a highly social species. While researchers were mapping the evolutionary history of the brain across more than 500 different mammals, they found that there is a link between the sociality of animals and the size of their brains relative to body size.
The brains of monkeys grew the most over time, followed by horses, dolphins, and dogs. The brains of solitary animals, like cats, grew much more slowly during the same period. The study suggests that social animals may have developed larger brains because group living is challenging--now I can see why humans have such large brains!