Horror as crazed bull terrier clamps jaws round neck of cow during attack on herd

This is the horrifying moment that a dog clings on to a cows neck for 30 second during a 15-minute attack against a herd.

Source: http://www.dailymail.co.uk/news/article-1383885/Horror-crazed-bull-terrier-clamps-jaws-round-neck-cow-attack-herd.html?ITO=1490

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