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"Because they are so often used for police work, some lines of GSDs have developed behavior that makes them unsuitable as household pets. Police lines often suffer an ADHD-like excitability and lack of impulse control. Some have developed what looks like ‘impulsive aggression’ – sudden, unprovoked, disproportionately savage attacks on another dog or on a human. If you are considering a German Shepherd Dog as a household companion, it is important to be sure you choose a dog from a working guide dog line or a companion dog line, and avoid breeders who supply police trainers and/or shutzhund clubs. This is particularly important if you expect the dog to interact safely with children and with other animals."