The heartbreaking moment was caught for posterity: A dog, sprinting down the road after a pickup truck, moments after apparently being abandoned at a convenience store.

A witness told CBS affiliate WWL-TV in New Orleans the man in the truck "deliberately" left the behind the dog, which chased him down the road.

Animal control experts were dispatched, but neither the truck nor the dog -- an apparent black German Shephard/lab mix -- were found.

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The Humane Society of Louisiana is offering a $250 reward for the arrest and conviction of the dog's owner or for the safe return of the dog.

Jeff Dorson, director of the Humane Society of Louisiana, said the chances of survival for animals abandoned in that way are "almost zero."