Cats and dogs are likely (as a group) no smarter than the other, they're just smart in different ways.

I've personally had both smart and dumb dogs, though I'm not sure any of my cats have been less intelligent than any other.

One of my dogs, after being placed in an outdoor pen with another, dug his way out. We found out because the other was barking up a storm, jealous of the other's freedom. The second dog hadn't noticed the hole under the fence where the first had escaped.

I have to make sure my bedroom door is closed securely at all times, otherwise one of our cats opens the door and gets in. They also know, as does the schnauzer, what we're talking about when we ask them if they want outside. And it's not just knowing a certain tone of voice either.

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If you're joking that's just cruel, but if you're being sarcastic, that's even worse.