Brutus is Dan's teddy bear who appears in the episode Dan Vs. Dan. Fake Dan was snuggling with him making Dan say a famous Julius Ceaser phrase, "Et Tu Brutus" which means "You too, Brutus?" due to his betrayal. It was revealed in Summer Camp that Dan has had Brutus since he was a child.
He also appeared in Dan Vs. New Mexico, Dan Vs. the Dentist and Dan Vs. the Animal Shelter.