Do dogs dream? It sure looks that way when they move or bark in their sleep. However, there's no way to know for sure if dogs dream the way humans do.
But we do know that dogs have Rapid Eye Movement sleep cycles just like us. This is the cycle of sleep when humans have dreams, so we can assume that dogs might as well, especially when we hear vocalizations and see leg movements. So next time your dog goes down for a nap, be sure to wish him sweet dreams.