Width Size 3: 6.5-4.0cm for 31-40 lbs. Ideal for Standard Poodle, Schnauzer, Sheltie, Jack Russell Terrier, Cocker Spaniel etc. Please mainly refer to the dog's paw width to choose the right size for your pup from the size chart in the image. QUALITY - MOLDED RUBBER BOTTOM: Non-slip, waterproof and flexible synthetic leather soles, Protection against sharp thorns, hot pavement, snow melting agent, salt during winter and protection against debris. Bring more comfort and keep your loving dog clean when they run outside. MATERIAL - WATERPROOF DOG BOOTS: The upper of the boot is made of high quality leather. Soft and breathable on the paws. Lightweight and practical, it allows the boots to be used indoors or outdoors, in wet and dry, hot and cold conditions. DESIGN - NATURAL PAW SHAPE: Dog tested and dog approved. Vets highly recommend. Conforms and clings to your dog's natural paw shape which is better protection for pet's ankle.Pet paw embroidery, fashionable yet durable and soft.Just use l water for washing.