Twentieth Century Fox will release “Diary of a Wimpy Kid: Dog Days,” the third installment in Fox 2000′s film series on Aug. 3.Nina Jacobson and Brad Simpson will produce under their Color Force banner. David Bowers, who helmed this year’s “Diary of a Wimpy Kid: Rodrick Rules,” the second movie in the series, will direct. Pic centers around “Wimpy Kid” Greg Heffley, who hatches a plan to pretend he has a job at a ritzy country club. But the plan fails and he suffers the dog days of summer vacation, which include mishaps at a public pool and a camping trip that goes wrong. 2010′s “Diary of a Wimpy Kid” was Jacobson’s first film after leaving Disney in 2006. Property became a reliable, relatively inexpensive franchise for Fox. Series is based on the novels by scribe Jeff Kinney. The first two “Wimpy Kid” pics have grossed more than $140 million worldwide with retail estimates for homevideo pegged at $54 million (“Diary of a Wimpy Kid: Rodrick Rules” hit shelves June 21). Maya Forbes and Wally Wolodarsky will pen “Dog Days” while thesps Zachary Gordon, Robert Capron, Devon Bostick, Rachael Harris, and Steve Zahn will return for the pic. Fox began shooting in Vancouver last week.