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Mr. Peanutbutter, the energetic and optimistic golden retriever, is voiced by Paul F. Tompkins in the animated comedy series BoJack Horseman. Tompkins brings his signature comedic timing and improvisational skills to the role, capturing Mr. Peanutbutter's cheerful demeanor and his tendency to make impulsive decisions. Through Tompkins' performance, Mr. Peanutbutter becomes a relatable and lovable character, despite his occasional naivety and lack of self-awareness.