1. Sun protection: The lenses of these dog sunglasses have passed the UV - 400 test and can block over 99% of ultraviolet rays. If your dog has an eye disease or loves outdoor activities, these dog goggles could be a good choice. 2. Suitable for small dogs and large cats, such as Yorkshire Terriers, Bichon Frises, Dachshunds, Shih Tzus, Schnauzers, Teddy dogs, Chihuahuas, etc. However, they may not be suitable for extremely small dogs. Please carefully check the size before purchase. 3. Product size specifications are as follows: - Frame height: 3.5 cm - Inner width of the frame: 11 cm - Outer width of the frame: 10.6 cm - Lens width: 4 cm - Nose bridge distance: 1.3 cm - Head circumference: 20 - 30 cm - Jaw circumference: 15 - 24 cm 4. Usage tips: Dogs might resist wearing goggles in the first few times. You can let them experience the benefits of wearing goggles, for example, take them on a car ride to the outdoors. When dogs realize that the glasses are protecting them, they may soon start to like these goggles.