http://www.dailymail.co.uk/news/article-2015611/Dog-bites-shark-
ncredible-houn d-rounds-seas-fearsome-beasts.html

Sharks are the undisputed kings of the shallows, voracious predators who,
with  one flash of a fin, can send crowds of paddlers fleeing for the safety
of the  shore.
But one plucky pooch showed a group of these fierce fish just how handy man's 
best friend can be when he rounds them up like a flock of timid lambs.
These incredible pictures show the moment a dog rounds on a group of sharks, 
and even dives under the water and gives one a nip.

more at the link

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