The 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 1:3.
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.
An adult Boxer typically weighs between 55 and 70 lb (25 and 32 kg). Adult male Boxers are between 22 and 25 inches (56 and 63 cm) tall at the withers; adult females are between 21 to 23½ inches (53 and 60 cm).Some boxers have weighed nearly 50 kgs.