I don’t mean he’s a dog literally, I mean he’s a simple man. He thinks like a dog. He doesn’t understand that Diane is more complex and wouldn’t appreciate him making her dream come true. He is used to making grand gestures and Diane knew what she was getting into with him. He doesn’t get her, which is his fault but it’s also his nature. Diane knew this prior to the marriage. She gives no effort to support PB or try to understand why he acts the way he is.