Person to person, the human brain varies a little in size and shape–but not dramatically so. After all, adult human skulls are all roughly the same size and shape.

But what about dogs? Does a chihuahua’s tiny skull hold the same kind of brain power as all that can fit inside a mastiff’s  giant noggin? Does the flatness of a pug’s skull affect its brain? In other words, has the development of wildly different dog breeds created different types of dog brains?

Apparently, it’s not a widely studied topic, but here’s one recent study that finds some fairly significant differences. Dog lovers, enjoy this scientific peek into your best friend’s brain!