German Shepherd

German Shepherds are medium to large-sized dogs. The breed standard height at the withers is 60–65 cm (24–26 in with an ideal proportion of 10 to 8 1/2. The AKC official breed standard does not set a standard weight range. They have a domed forehead, a long square-cut muzzle with strong jaws and a black nose. The eyes are medium-sized and brown with a lively, intelligent and self-assured look. The ears are large and stand erect, open at the front and parallel, but they often are pulled back during movement. A German Shepherd has a long neck, which is raised when excited and lowered when moving at a fast pace.
Intelligence:
German Shepherds were bred specifically for their intelligence,[14] a trait for which they are now famous. In the book The Intelligence of Dogs, author Stanley Coren ranked the breed third for intelligence, behind Border Collies and Poodles. He found that they had the ability to learn simple tasks after only five repetitions and obeyed the first command given 95% of the time Coupled with their strength, this trait makes the breed desirable as police, guard and search and rescue dogs.
Temperament:
German Shepherds are moderately active dogs and are described in breed standards as self-assured. The breed is marked by a willingness to learn and an eagerness to have a purpose. They are curious, which makes them excellent guard dogs and suitable for search missions. They can become over-protective of their family and territory, especially if not socialized correctly. They are not inclined to become immediate friends with strangers.German Shepherds are highly intelligent and obedient, as well as being protective of their owners.
Aggression and biting:
While an Australian report from 1999 provides statistics showing that German Shepherds are the breed third most likely to attack a person in some Australian locales once their popularity is taken into account, the percentages of GSD attacks drops to 38th while Pit Bull Terriers are the most likely to attack when popularity is taken into account.