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"Doctor" Granny feels rejected when Elly May calls in a veterinarian (Russell Collins) to look after one of her ailing critters. The fun really begins when Granny mistakes a door-to-door insecticide salesman for the aforementioned vet. Mark Goddard, later one of the stars of Lost in Space, appears as the nonplussed salesman. First telecast March 11, 1964, "The Critter Doctor" was one of the few episodes of The Beverly Hillbillies that was not telecast in the order of its production; it was filmed before "Lafe Returns," "Son of Lafe Returns," "The Clampetts Go Fishing," and "A Bride for Jed," but broadcast after those episodes had aired.