The Czech lines were originally bred in Communist Czech as state working dogs. Czech line German Shepherds and East German DDR German Shepherds are essentially the same bloodlines. The bloodlines in West Germany were split between working line dogs and show line dogs. It is important to recognize that the working line and show line German Shepherds from West Germany are vastly different.
The Czech Shepherd has a large blocky head with big bone structure and is much leaner in build. These shepherds have straighter backs and fewer problems with hip dysplasia. However, they are very high-energy dogs, and need plenty of exercise and dog sports like rally, obedience, agility, tracking, and so forth.
Show line dogs are bred to be physically attractive but lack the courage and strong nerves of a true protection dog.
Accepting that West German show line dogs are unfit for protection work, the true comparison is between the West German working line (often stated simply as German working line), and the DDR/Czech line. There has been much debate over which is superior, and this debate may continue for years to come.
Some people consider the West German lines to be superior, arguing that the DDR/Czech lines were developed before the split between working and show lines, and are not extraordinary in either discipline. Both lines were recovered from the original German bloodlines after WWII, and both have been continuously built up and bred for working qualities over the past 60 years.
The bottom line is that they are both working line dogs. Show lines are a better choice for homes with children and working lines for protection work.
That said if you’re not sure as to whether you should get a German Shepherd or Czech Shepherd, keep in mind that American Shepherds have a calmer temperament and a lower energy drive, so they may be easier to have at home around children.
Today, the use of police dogs for home protection is popular for many reasons. As guard dogs, they have a natural ability to guard and protect, while being a good companion dog at the same time. Police dogs do what they are trained to do from using their noses to sniff out explosives, contraband drugs, weapons, currency, and even banned agricultural goods.
Although many police dogs are bred and raised in Europe, there are also U.S breed programs. Some police dogs are also adopted from animal shelters. These dogs receive intense training from handlers.
All police dog breeds need to have a combination of socialization and positive dog training, and while some dogs may be more difficult to train than others, you’ll need to read about and understand your dog breed before bringing him home to ensure that you’ll be a successful dog parent.