'Unbelievable'dog bites shark in shocking beach attack

One pooch showed a shark who's top dog.

In an incredible video, a dog was spotted in Australia going after a group of sharks -- even diving under the water to give one a bite.

Someone was filming as two dogs swam back to shore through a group of sharks. But, a surprise comes along as the dog lunges for one of the sharks.

Describing the dogs antics, the beachgoer shooting the video says, "Here they come. [The dog's] going down. He's giving him a bite!

"The dog's biting the shark! The dog is underwater with the shark! What the hell!"

He end it with: "I''ve seen everything now."