You’ve probably been here before: you’re leading your dog around the neighborhood on a typical pack walk when suddenly there’s a siren way off in the distance. You barely notice it, but your dog’s ears immediately perk up. As it gets closer and closer (and louder and louder), she becomes more and more agitated or excited. Finally, it rounds the corner, headed your way, and as it nears you and passes by, your pooch lets loose with a glorious howl, head thrown back like she was a wolf out in the desert. What’s going on here? Why do dogs howl?