A rock, no matter what you may here about dogs and so forth, are the most loyal companions you could ask for. Maud knows this first hand, and she has decided to share her experiences with rock responsibility to the rest to Equestria.
Back when Pinkie Pie was still a filly, Maud joined her first party. After much retrospection, Maud came to a better understanding of both her and her sister.
Boulder was a rock, a normal peacful rock, that is until one day, a pony named Maud took him in as her own pocket pet. The adventures they shared will never be forgotten. This is the tale of Maud and Boulder.