The German Shepherd is a breed of medium to large-sized working dog that originated in Germany. The breed was officially known as the Alsatian in Britain until 1977 when its name was changed back to German Shepherd.
The Rottweiler is a breed of domestic dog, regarded as medium-to-large or large. The dogs were known in German as Rottweiler Metzgerhund, meaning Rottweil butchers' dogs, because their main use was to herd livestock and pull carts laden with butchered meat to market
The Malinois is a medium-to-large breed of dog, sometimes classified as a variety of the Belgian Shepherd dog rather than as a separate breed. The breed is used as a working dog for tasks including detection of odors such as explosives, accelerants etc
The pug is a breed of dog with physically distinctive features of a wrinkly, short-muzzled face, and curled tail. The breed has a fine, glossy coat that comes in a variety of colours, most often fawn or black, and a compact square body with well-developed muscles. Pugs were brought from China to Europe in the sixteenth century and were popularized in Western Europe by the House of Orange of the Netherlands, and the House of Stuart.