Gramps' blames Lassie's son Laddie's illness on the spray used by a local crop duster.

large mongrel dog who's been a nuisance on neighbors' farms is trapped in a gorge, and although most of the farmers want the stray dead, the Calverton dog pound representative wants to save him.

During a surveying trip at a former bombsite sleighted to become a national grassland, Scott carefully disarms the unexploded bomb next to a trapped man while Lassie shuttles supplies to him.