Designed for props and costumes. Please keep an eye on your pet while they have them on. Fits most small dog breed up to 15lbs such as Chihuahua, Maltese, Pomerian, Shih-tzu, Toy poodle, Yorkshire Terrier. These sunglasses may NOT fit Flat nosed or Wide faced dogs. Fits small dogs up to 15lbs (Teacup &Toy breeds). Pet Necklace chain is made of plastic. UV400 Lenses. Please measure your pet's face before purchasing. Designed for props and costumes. Please keep an eye on your pet while they have them on. Fits most small dog breed up to 15lbs such as Chihuahua, Maltese, Pomerian, Shih-tzu, Toy poodle, Yorkshire Terrier. These sunglasses may NOT fit Flat nosed or Wide faced dogs. Fits small dogs up to 15lbs (Teacup &Toy breeds). UV400 Lenses. Pet Necklace chain is made of plastic.