For reference: Lucy weighs 23 lbs and wears a Size SMALL

• Size XS for dogs 8 - 14 pounds and with a chest size of 13" - 17"
• Easy to put on and take off
• Easy to create a snug, comfortable fit which is essential for its effectiveness in treating noise anxiety
• Attractive, durable fabric that resists collecting hair
• Machine washable for when necessary and it lasts at least the life of the initial user