*Box was opened to try on, but it did not fit.* Neck Size: 11.5 inches Chest Size: 17 Inches Minimum Weight Recommendation: 10 Pounds ThunderShirt is the #1 vet recommended calming wrap & already used by millions of dogs to help calm anxious behaviors! This easy-to-use calming wrap for dogs is a drug-free option which applies gentle calming pressure around your dog’s torso, similar to swaddling an infant. Use ThunderShirt whenever your dog experiences anxiety in situations such as thunderstorms, fireworks, vet visits, separation, loud noises, traveling, and having visitors.