While performing his duties on the ranch, Hank the Cowdog finds that his bones are disappearing, and his friend Drover claims to have seen a monster do it.
Suffering in a family full of females, ten-year-old Justin feels that cleaning and keeping house are women's work until he spends time on his beloved grandfather's ranch.
While working on a mysterious case involving disappearing eggs and a fiddle-playing fox named Frankie, Hank the Cowdog falls for Miss Beulah, the beautiful collie.
Hank the cowdog goes to the rescue as a wild, one-eyed horse creates havoc on the ranch but some of his outrageous stunts get him into more trouble than he bargained for.