They have made an in-depth study of air currents to help them combat fires and probably be more than happy to pass this information on to you . There is a study done by a scientist which states that the color of a canine has a direct effect on the scenting ability. For instance, a white canine does not possess the same ability to scent as does a canine which is darker in color. That is one of the reasons you will never see a white canine in police service in foreign countries. The pigment of the canine's skin or hair has a direct effect on his ability to smell.
Scent is water soluble.
For the dog to be able to turn a scent raft into a solution for acceptance by his receptors, his nose must be moist. There is no reason why a canine cannot take a big drink instead. A human will very seldom replace exactly what moisture they have lost because of his ability to sweat. A canine cannot sweat and can replace exactly what moisture he has lost by drinking, so let him drink virtually all he wants.