The Takeaway: Because your li’l BFF loves Halloween as much as you Your four-legged bestie is ready for trick-or-treating with this scary cute Sweater. Size guide: Size S: Neck - 13.8”, Chest – 22.4”, Back Length – 13” Size M: Neck - 17”, Chest – 26.4”, Back Length – 14.6” Size L: Neck - 20”, Chest – 29.5”, Back Length – 16.1” Size XL: Neck - 20.9”, Chest – 32.3”, Back Length – 18.9” Size XXL: Neck - 22.4”, Chest – 35”, Back Length – 20”