Originally Posted by LoJack
I've seen small water bottles that have a pump and hose with a mist nozzle at the end. They are really nice for hot days. You could rig it up to deploy a small amount of mist that might last a while as you ride down the road.
I was gonna pack a squirt gun, but this might be a better idea. Although I was under the impression dogs only cool down from panting, not from perspiration or water on the skin/fur.