My Dog Rusty (1948)

Hugh Mitchell is campaigning for Mayor of Lawtonville against the incumbent, Fulderwilder, but his having trouble with his son, Danny, who persists in telling lies. Trouble starts brewing when Danny, who is "assisting" the town's new doctor, Antonia Cordell, slips his father's campaign handbills into the envelopes containing the doctor's announcement cards. Mayor Fulderwilder accuses Mitchell of complicity in the affair.