A fresh take on the enduring cats-vs.-dogs intelligence debate emerges from neuroscience research. In the first study to precisely count cortical neurons—the 'little gray cells' driving thinking, planning, and complex behaviors—in carnivore brains, dogs significantly outpace cats. Findings show dogs with about 530 million cortical neurons, versus cats' roughly 250 million. (Humans, by comparison, have 16 billion.)
Researchers examined brains from one or two specimens across eight carnivoran species: ferret, mongoose, raccoon, cat, dog, hyena, lion, and brown bear. They hypothesized carnivores would exceed herbivores in cortical neurons, but results defied expectations. Small- and medium-sized carnivores mirrored herbivores' neuron-to-brain-size ratios, highlighting comparable evolutionary pressures for predators to hunt and prey to evade.
Large carnivores fare even worse proportionally. A golden retriever's brain boasts more neurons than those of hyenas, lions, or brown bears—despite the bigger predators' brains reaching up to three times the size. The brown bear is a stark case: its brain is 10 times larger than a cat's, yet holds a similar neuron count.
