Mrs. Captain Peanutbutter appears to be a female husky or some other sled-dog breed with grey and white fur. She has a black snout.
According to the model sheets, she is slightly less than 6 1/2 ft tall.
She is seen wearing a navy button-down shirt, tucked into a purple and lavender checkered ankle-length skirt, white belt with a gold flower buckle, and tan ankle-length boots.
Little is known about her personality.
Mrs. Captain Peanutbutter is first mentioned in Old Acquaintance when Mr. Peanutbutter and Diane go to the Labrador Peninsula. Mr. Peanutbutter asks Captain Peanutbutter where she is. Captain Peanutbutter tells him she is "in Alaska, running the Iditarod" which implies she's a sled-dog.Surprise!, At Mr. Peanutbutter and Pickles' house, BoJack introduces Eduardo the sober companion to Mrs. Captain Peanutbutter and Captain Peanutbutter. He explains Eduardo is here to keep him out of trouble. Captain Peanutbutter asks if Eduardo is one of those fainting goats. Eduardo laughs and says only if he panics.
Later, Pickles says she is going to tell everyone about Mr. Peanutbutter cheating. Mr. Peanutbutter then says to think of his family, as they need him to be strong right now. Mr. Peanutbutter goes on to say Captain Peanutbutter feels like he is trapped in a loveless marriage with his wife.Captain looks at Mrs. Captain Peanutbutter guiltily. Pickles then asks if anyone could really blame her. Pickles say every time she gets into a conversation with Captain she thinks, "if I were married to this guy I'd gnaw my own hand off just to get the ring off my body." Mr. Peanutbutter then retorts that at least no one in his family has anger issues.
Later, various guests pop out from their hiding places, and there is a universal sigh of relief. Everyone then makes a mad dash for the door, and then they leave.
- Her name before her marriage to Captain Peanutbutter is never specified.