The best tag size for your dog depends on their size, breed, and your preference! Size S (28mm ø x 51mm total height): Perfect for very small dogs, puppies, and cats. They’re less likely to interfere with their comfort. Size L (35mm ø x 58mm total height): Ideal for medium to large dogs, fluffy breeds, or smaller dogs with big personalities (or just super long legs). The total height measures from the top of the split ring to the bottom of the tag. Both sizes are lightweight (~10 grams). We recommend selecting a size based on your dog’s height so the tag hangs comfortably from their collar without hindering their movement. Make sure the tag is positioned outside of your dog's reach to prevent chewing.