The Takeaway: Bark ‘n boo (Trick or) treat your four-legged bsf to this scary cute costume, perfect for keeping ‘em cozy during spooky season. Size Guide: XS: Neck –12”, Chest –14”, Back- 8.4”; 4-6 lbs S: Neck – 16.5”, Chest –22.8”, Back - 11.8”; 10lbs M: Neck – 18.9”, Chest – 26.7”, Back - 13.3”; 21lbs L: Neck – 22”, Chest – 30.7”, Back - 14.9”; 33lbs XL: Neck – 23.6”, Chest – 33”, Back – 18.1”; 40lbs XXL: Neck – 25” Chest – 36”, Back – 18.8”; 48lbs