Smart pooch

When I saw the tout to this video from the Arizona Republic, I was a bit skeptical. But, Sandy proved me wrong.
In addition to putting mail in the mailbox and letting the postman know it's there, she can do math.
Watch Sandy the dog add numbers.
My dog, Ace, isn't that advanced, but he does understand the command, "turnaround" and "lets go downstairs."
How smart is your dog?