The Boxer is one of the most popular working breeds. His character is of the greatest importance as he has always been renowned for his great loyalty to his master and is an ardent protector of his own family. He is a powerful dog, full of energy, has a lean head in proportion to its body with lower jaw extending beyond the upper jaw. he has a large black nose with open nostrils He has a short tail carried high. In America and continental Europe, the boxer's tail is cropped, but in UK it is left natural. The colour is fawn, brindle and fawn in various shades from light yellow to deer red. White markings are allowed and black mask is essential.