Throughout the picture, the German Shepherd named Hawkshaw repeatedly changes coloration from all tan to a standard looking dark back against a lighter colored underside and legs.
When the henchman who's firing his gun with his right hand at the dog chasing the truck is shown from behind, his left arm is clearly resting on one of the silk bales, presumably for balance. However, when the camera shows him from his front, his arm is clearly not high enough to rest on the bale.
Although the hijackers throw the bales of silk out of the moderately fast-moving-freight car, a half dozen of the bales end up within yards of each other on the side of the tracks.