Brison Aldridge was playing in a yard near his home in Manor when the pit bull mix escaped from a nearby house.
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Video shows the dog chase the 7-year-old and attack him as he tries to run away.
The dog's owner raced after the animal and eventually pulled it off of him.
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The boy suffered numerous bites and scratches to his legs and back.
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He was taken to the hospital where he was treated and released.
The dog's owner surrendered it for testing and a mandatory quarantine.