The coat is smooth and tight-fitting; colors are fawn, brindled, or white, with or without white markings. Boxers are brachycephalic (they have broad, short skulls), 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 which became extinct by crossbreeding rather than by a decadence of the breed. In the UK and Europe, fawn Boxers are typically rich in color and are often called 'red'. 'Brindle' refers to a dog with black stripes on a fawn background. Some brindle Boxers are so heavily striped that they give the appearance of 'reverse brindling', fawn stripes on a black body; these dogs are conventionally called 'reverse brindles', but that is actually a misnomer—they are still fawn dogs with black stripes.
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