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By the 1920s, Strongheart, who had been originally trained as a police dog in Germany and, even more famous, Rin Tin Tin who was rescued as a puppy in France just before the end of World War I, had hit the big screen. As a result, the breed gained extreme popularity outside of Germany. Unfortunately, this led to irresponsible breeders who introduced poor breeding practices in an effort to cash in. Problems in temperament and health began to develop within the breed. By the end of the Second World War, the popularity of the breed had declined somewhat. However, not before genetic disorders and poor temperament issues became common in some bloodlines. Since that time, dedicated breeders have worked to restore the temperament and physical strength of the original German Shepherd.