Developed in Germany, the Boxer is a breed of stocky, medium size, short-haired dog. The coat is smooth and fawn, brindled, white, or even reverse brindled with or without white markings. Boxers are brachycephalic (they have broad, short skulls), and have a square muzzle, mandibular prognathism (an underbite), very strong jaws and a powerful bite ideal for hanging on to large prey. The Boxer was bred from the Old English Bulldog and the now extinct Bullenbeisser and is part of the Molosser group.Boxers were first exhibited in a dog show for St. Bernards at Munich in 1895, the first Boxer club being founded the next year. Based on 2009 American Kennel Club statistics, Boxers are the sixth most popular breed of dog in the United States for the third year in a row—moving up in 2007 from the seventh spot, which they'd held since 2002The head is the most distinctive feature of the Boxer. The breed standard dictates that it must be in perfect proportion to the body and above all it must never be too light. The greatest value is to be placed on the muzzle being of correct form and in absolute proportion to the skull. The length of the muzzle to the whole of the head should be a ratio of 1:2. Folds are always present from the root of the nose running downwards on both sides of the muzzle, and the tip of the nose should lie somewhat higher than the root of the muzzle. In addition a Boxer should be slightly prognathous, i.e., the lower jaw should protrude beyond the upper jaw and bend slightly upwards in what is commonly called an underbite or "undershot bite".Boxers were originally a docked and cropped breed, and this tradition is still maintained in some countries. However, due to pressure from veterinary associations, animal rights groups and the general public, both cropping of the ears and docking of the tail have been prohibited in many countries around the world. There is a line of naturally short-tailed (bobtail) Boxers that was developed in the United Kingdom in anticipation of a tail docking ban there; after several generations of controlled breeding, these dogs were accepted in the Kennel Club (UK) registry in 1998, and today representatives of the bobtail line can be found in many countries around the world. However, in 2008, the FCI added a "naturally stumpy tail" as a disqualifying fault in their breed standard, meaning those Boxers born with a bobtail are no longer able to be shown (or, in some cases, bred) in FCI member countries. In the United States and Canada as of 2009, cropped ears are still more common in show dogs. In March 2005 the AKC breed standard was changed to include a description of the uncropped ear, but to severely penalize an undocked tail. Although a Boxer may not be as big as another breed, make no mistake, what a Boxer may lack in size or weight, it makes up for in near unmatchable strength.Boxers are a bright, energetic and playful breed and tend to be very good with children. They are active and incredibly strong dogs and require adequate exercise to prevent boredom-associated behaviors such as chewing, digging, or licking. Boxers have earned a slight reputation of being "headstrong," which can be related to inappropriate obedience training. Owing to their intelligence and working breed characteristics, training based on corrections often has limited usefulness. Boxers, like other animals, typically respond better to positive reinforcement techniques such as clicker training, an approach based on operant conditioning and behaviorism, which affords the dog an opportunity to think independently and to problem-solve. Stanley Coren's survey of obedience trainers, summarized in his book The Intelligence of Dogs, ranked Boxers at #48 - average working/obedience intelligence. Many who have worked with Boxers disagree quite strongly with Coren's survey results, and maintain that a skilled trainer who uses reward-based methods will find Boxers have far above-average intelligence and working ability.The Boxer by nature is not an aggressive or vicious breed but, when provoked, is a formidable guardian of any family or home and, like all dogs, requires socialization. Boxers are generally patient with smaller dogs and puppies, but difficulties with larger adult dogs, especially those of the same sex, may occur. More severe fighting can also occur among female boxers. Boxers are generally more comfortable with companionship, in either human or canine form.