- Earned six service stripes in the German Red Cross.
- Was never able to howl. His brother Flash doubled for him in scenes that required howling.
- A plaque kept over his bed quoted the Bible's book of Job: "Ask the very beasts, and they will teach you."
- The first canine star in motion pictures, he was a magnificent German Shepherd dog.
- Owner Laurence Trimble worked tirelessly to overcome the dog's harsh military-style prior training, staying with the dog virtually non-stop for several months and emphasizing rewards for positive behavior.
- He had an astonishing level of instinct regarding the character of strangers, both good and bad; he would often suddenly pursue passersby who long after were found to have been embezzlers, frauds or spousal abusers.
- Strongheart ate ten pounds of meat daily while working; two pounds if loafing.
- Trained as a WWI police dog in Germany, he was brought to the U.S. by director Laurence Trimble and his wife, writer Jane Murfin.
- Injured by shrapnel after the second battle of Ypres.
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