What's with my dog loving peanuts?

I love peanuts in the shell. My Great Pyreneese also loves peanuts in the shell. What is with this? I have had many dogs in my lifetime, but none that loved peanuts, like Maggie. Is this dog nuts? And, to top it all, she will crack open the shells and eat only the peanuts inside. We only buy the unsalted type of shelled peanuts, since salt is not good for dogs. She also loves bananas. Question: so, what gives with Maggie? She is nuts for peanuts! And, should we teach her to clean up her empty shell mess?