Horrifying CCTV footage shows the moment a woman is viciously mauled by a dog as she walks down the road with a friend.
The animal initially walks past her but then appears to change it's mind, go back and suddenly charge at her with no provocation.
The animal locks its jaws around her leg as her friend desperately tries to drag the animal off her as she falls to the floor.
According to reports in Mexico City, where the brutal attack happened, the dog's owner desperately tried to stop people from hitting it.
Witnesses have said the animal was a boxer and pitbull cross.
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