Mickey and Minnie go picnicking but make the mistake of bringing Pluto (referred to here as "Rover") along. The hound chases rabbits and damages Mickey's car; meanwhile, animals ransack the picnic lunch and Mickey dances with Minnie to "In the Good Old Summertime." Finally, a sudden thunderstorm appears and the picnic is abandoned altogether, but Mickey and Minnie laugh it off as they start to drive home, with Pluto serving as an impromptu windshield wiper.
This short was adapted by Floyd Gottfredson for a week-long arc Mickey Mouse daily comic strip, running from January 5-10, 1931. Because Pluto hadn't been introduced in the strip at that point, he was replaced by a different dog named "Tiny".