Animated. Playful. Energetic. A little cuckoo in the best way. These are a few ways that Boxer parents will describe their pups. Boxer puppies are the eighth most popular breed in the United States for good reason.A Boxer puppy’s adorable smushed face is almost reason enough to bring one into your family. Boxer puppies have a jaw known as an “undershot,” which means the lower jaw curves and juts out slightly from the upper jaw. In layman’s terms, that just means your Boxer will likely have the most charming underbite ever.