[r9etb]

The upshot: behavior and cognitive abilities have a strong genetic component. And one must presume that the finding carries over to humans as well.

This is neither "good," nor "bad," of course; but it does have some rather uncomfortable implications.

[allmendream]

Yes, but dogs were selectively bred for different traits, intelligence not always being one of them.

Humans are all very similar genetically, nor is there reason to assume that any gene that had an unambiguous positive effect upon intelligence wouldn't have rapidly reached near 100% penetrance in the human population.