I learned that this was a dog originally bred for herding, but is now known best as a police dog. It's popularity as such surpasses even the German Shepherd.
The temperament is described as intense. A high-energy dog, it needs plenty of mental stimulation and physical exercise. The book described this dog as aloof with strangers and sometimes aggressive toward other dogs and animals. It's protective of both its home and family.
From a distance, I think it could be mistaken for a German Shepherd, with the same body build, coloring, and head carriage. However, the photographs in my book make it appear rather unattractive - with eyes too small and close set.
These dogs would definitely be intimidating to an intruder, as they stand approximately 24" tall.
If you, or someone you know, has one of these dogs, I'd love to hear more about it from your point of view - and I'll bet everyone else would too.
If you enjoy reading about the dog breeds, you might like a copy of the book I use: "The Encyclopedia of Dog Breeds" by Colie. To make it easy, I found the link from Buy.com - where you always save over the Amazon price!