Jeff thinks Lassie needs a vet when her time comes, but a storm is brewing and Gramps says dogs can cope. Dr. Wilson: Frank Ferguson. Mrs. Wilson: Frances Morris.

While Jeff prepares for the county fair, a spoiled little girl visits the farm and continually tries to hurt Lassie.

Jeff wants to adopt an orphan fawn, but Gramps says there is no place for wild animals on a farm.

Lassie, staying at a neighbor's house while the family as at the county fair, is blamed for the damage done by Chipper, a chimpanzee being nursed by Mrs. Collins.

Now accompanied by Lassie, Ron and Dale have the gold they have been placer mining assayed--and just for the heck of it, buy an old treasure map and go in search of a gold mine. Once they find the place, however, their search is endangered by fire heading for some old dynamite left in a shed.