Mr. Peanutbutter, the star of Mr. Peanutbutter's House, is an adult male yellow Labrador Retriever, who is BoJack Horseman's friend and former sitcom rival. He is one of the main characters in BoJack Horseman. He dates and later marries Diane Nguyen, although the two get a divorce in Season 5.
In the same season, he plays Fritz on Philbert, and he begins dating a young female pug named Pickles Aplenty. He proposes to her in the season finale to avoid admitting he cheated on her by sleeping with Diane.
In Season 6, he plays the eponymous character Birthday Dad in the show of the same name, which is a huge success. After Pickles learns about Diane, they agree she can sleep with multiple guys until she finds the right one to cheat on him with, although this ends up with her leaving him for Joey Pogo, and they officially break up through text in Xerox of a Xerox.
