List of dog breeds View guard dogs in action

Belgian Malinois[malinwA´], a breed of medium-sized working dog developed in Belgium at the turn of the 20th cent. It stands from 22 to 26 in. (55.9–66 cm) high at the shoulder and weighs from 50 to 60 lb (22.6–27.2 kg). The smooth, straight coat is short except for longer hair around the neck, on the back of the thighs, and on the tail. It is brindled fawn in color with a black mask. One of three closely related types of sheepherding dogs from Belgium, the Malinois is distinguished from the other two, the Belgian sheepdog and the Belgian Tervuren, by coat and color only. In addition to being used for its herding abilities, the Malinois has frequently been trained as a police dog.

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Doberman pinscher[dO´burmun pin´shur], breed of large, compact working dog originating in Germany c.1890. It stands from 24 to 28 in. (61–71 cm) high at the shoulder and weighs from 60 to 75 lb (27–34 kg). Its short, smooth, close-lying coat may be black, brown, or blue in color with rust red markings above the eyes and on the muzzle, chest, legs, and vent. The Doberman was named for Louis Dobermann of Apolda, Germany, who developed the breed by crossing native German sheepherding-dog stock with the Rottweiler, Manchester terrier, and the old German pinscher. The Doberman was first used as a guard dog and pet. Later, when its great capacity for training was appreciated, it became increasingly popular as a police and war dog.

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German shepherd, breed of large, muscular working dog perfected in Germany at the turn of the 20th cent. It stands about 25 in. (64 cm) high at the shoulder and weighs from 60 to 85 lb (27.2–38.5 kg). Its double coat is composed of dense, woolly underhair and a medium-length, harsh, straight or slightly wavy outercoat. Although it may be any color except white, it is usually black and tan, black, or gray. Developed over centuries from sheepherding and farm-dog stock, the German shepherd has been trained in a variety of specialities other than herding, e.g., as a police dog, as a carrier of messages and a patrol dog in war, and as a leader of the blind. It is also very popular as a pet.

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Rottweiler[rot´wIlur], breed of sturdy working dog developed from a Roman cattle dog introduced into S Germany more than 1,900 years ago. It stands from 21 3/4 to 27 in. (55.3–68.6 cm) high at the shoulder and weighs from 75 to 90 lb (34.0–40.8 kg). Its short, flat-lying, coarse coat is black with markings ranging in shade from tan to mahogany on the cheeks, muzzle, chest, and legs and over both eyes. The tail is docked close to the body. Named for the German township of Rottweil, a livestock center in the Middle Ages, the Rottweiler was used both as a cattle drover and as a guardian of traveling merchants. When the driving of cattle by dogs was outlawed in Germany at the turn of the 20th cent., the Rottweiler was used as a draft animal and, increasingly, as a police dog. Its police-dog ability saved the breed from extinction. Today the breed is still much used in police work and is also raised as a pet.

source: http://reference.allrefer.com/encyclopedia/R/Rottweil.html