Cody Cameron.
Mr. Weenie.
A dachshund.
Cody Cameron (also as Nate and a distinctive dog), Crispin Glover, Steve Schirripa (who was replaced by Kevin Michael Richardson as the sub voice for Roberto), Fred Stoller, Sean P. Mullen (who was also replaced by Kevin Michael Richardson as the sub voice for Roger), Diedrich Bader (who was also replaced by Jeff Bennett {who was once rumored to voice Fifi in Open Season 3, even though this wasn't true} as the sub voice for Rufus), Olivia Hack, and Dana Belben (as the Russian cats in Open Season 3). An uncredited Frank Welker provided the barking and meowing noises for the pets.
Elliot and Giselle are getting married, when Elliot suddenly sees Mr. Weenie getting taken away by Bob and Bobbie. Afterwards, Elliot, Boog, and the others go on a mission to save Weenie. Along the way, they have to enter a vacation spot for pets called Pet Paradiso to find Mr. Weenie. After saving him, they encounter the leader of the pets, a maniacal poodle named Fifi, and must fight him before leaving. Together, Boog and Elliot defeat Fifi and Mr. Weenie decides to go back to his owners and he bids farewell to his wild friends. After Elliot and Giselle are married, Elliot's antler breaks off, disappointing him.
The voice for Mr.Fox is George Clooney.
Gilbert Gottfried was the voice of Mr. Mxyzptlk .
Tom Kenny is the voice of Mr. Lopart on Handy Manny.
A fisherman in the Season 2|Episode 12, Fifteen Minutes of Shame&The Black Knight from the Season 3|Episode 9, Mr. Saturday Knight
The voice of Mr. Potato Head is Don Rickles.
The voice of Mr. Krabs is Clancy Brown
Clancy Brown is the voice of Mr Krabs.
Mr. Lawrence