What may be the tallest dog in the world has a very important job to go along with his abnormal size. (CNN/KSWB)

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Video: Meet Bentley, the world's largest service dog

Updated: Thursday, 16 Aug 2012, 8:27 AM EDT
Published : Thursday, 16 Aug 2012, 8:27 AM EDT

LA JOLLA, Calif. (CNN/KSWB) - What may be the tallest dog in the world has a very important job to go along with his abnormal size.

The dog and his handler are raising money to help kids fight cancer.

A tornado roared through Oklahoma City suburbs, flattening entire neighborhoods,…