There's little that makes a dog happier than getting to stick its head out of a fast moving vehicle. Which is why the pooch in the clip below should be on cloud nine as he speeds down the road with his fur in the air.

But instead there's something impeding his joy. Those pesky cars and trucks going in the other direction. Watch what the dog tries to do to the oncoming traffic that dares share his road.

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Almost got 'em, boy! Keep chomping!

Of course there's no real chance that Pac-Dog will finally hit pay dirt. But if he did . . . talk about biting off more than you can chew.