i own four german shepherds. they are breed of medium to large-sized working dog that originated in Germany
I love german shepherds, have you trained them at all?
I have not professionally trained them, but they are the preferred breed because of their trainability.
I know a few people with german shepherds and they are very loyal family dogs as well. 
Yes, very loyal and popular. They are the 2nd most registered breed buy the American Kennel Club.
Wow, I didn't know that. What's the 1st most registered breed?
Not sure but The AKC official breed standard does not set a standard weight range with german sheperds.
So all different sizes of german shepherds can be registered with the AKC?
Kingdom.
Description.
German Shepherds are medium to large-sized dogs. The breed standard height at the withers is for males, and for females. German Shepherds are longer than tall, 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. The ears are large and stand erect, open at
and trainability can be measured at noncompetitive herding tests. Old Time Farm Shepherds that exhibit basic herding instincts can also be trained to compete in farm dog trials. McDuffie was adamant that selection by herding trials would not result in the same breed of dog.
Old-Time Farm Shepherds have a specialized motivation; they often move livestock out of a sense of rules and routine, and vary their working strategies to suit the situation. They are easy to train to leave the livestock alone unless the stock are not where they belong