Bruno, a war dog under rehabilitation, suffers from flashbacks after being exposed to blasting and escapes from his run. Warning the construction crew and local ranchers that Bruno is dangerous, Lassie, Bob, and his trainer Mike then try to find him before the others do.

In the second of a two-part series, Lassie finds Bruno, a retired war dog that has been spooked by dynamite explosions. Lassie tries to calm the frightened and confused canine, and must intervene to prevent ranchers from shooting the dog before his master arrives.