Name of indy movie in which lonely woman confesses to with dog?

Can anyone remember the name of the movie that came out a few years ago, an Indy, about a couple about to get married. The man tells the woman they should have no secrets before they get married. The woman agrees but hesitates before telling him her big secret, that once, while lonely, she allowed her horny dog to mount her. She eventually tells him and their lives fall apart very comically. I want to find this again on DVD!