Perhaps the most widely recognizable ways dogs communicate to others is with their tails. In addition to the joyful wagging tail, a dog’s tail can communicate a range of other emotions. For example, a slow wagging means your dog is feeling cautious, and a stiff tail held high means your dog is on alert. A low tail means your pup is feeling content, but a tucked tail means he is feeling scared. If your dog is wagging his tail vigorously enough to make his butt to wiggle (we all know what I’m talking about), he’s absolutely elated to see you!