"The first man told the dog to: 'Go! Go over there!' The man in the back of the pick-up proceeded to pull up the tail-gate of the truck," Lorie Hollis, a witness, said in a statement Monday from the Humane Society of Louisiana. "Appearing confused, the dog jumped up and put his paws on top of the tail-gate. The truck sped away, leaving the dog behind"  Hollis said she got in her car and went after the truck and the dog, described as a black German Shepherd-Lab mix with a small patch of brown under its neck.  "The truck crossed over two lanes of traffic, and still the dog followed," she said.  Eventually she lost track of the vehicle and its canine pursuer.  "My heart is broken, and I am in shock that someone would treat a dog like this," she told the Humane Society.  But she managed to draw more attention to the case by posting on Facebook a cellphone photo she took of the dog running after the truck. The post was rapidly shared hundreds of times.  Now, the Humane Society is offering a reward of $250 for information leading to the arrest of the owner and the safe return of the dog.  "If people feel they can no longer care for a pet, all they have to do is surrender him or her to a nearby rescue group or shelter, rather than abandon the poor animal at some random location, where their chances of survival are almost zero," said Jeff Dorson, the director of the society. "This is truly a cowardly act and a punishable offense."  Tampa police make arrests in tortured dog case  The society also called on volunteers to canvass the area where the dog was last seen and to let it know if the animal is found. The gas station is in the city of Slidell.  The Human Society said calls were placed to the local Animal Control service, which sent a unit to the scene.  Hollis said the vehicle that drove off was an old blue-and-white pickup truck. She said the two men in it were African-American, one of them elderly.  "Unfortunately, we routinely receive these type of reports, where dogs are dumped from a car or truck and left to fend for themselves along highways or back country roads," Dorson said. "As we know all too well, people can be cruel and heartless."  He said the society hoped to provide the dog, if it's found, with "a loving home and a happy life."  Man reunites with stolen dog during search for new pet
Two men in a pickup truck abandoned a dog at a Louisiana gas station and drove off, leaving the animal desperately chasing them, an advocacy group says.