Size 4: Width 2.16 inches for 36-43 lbs. Great for Japanese Akita, American Cooker Spaniel, etc. Please refer to the picture size chart, and choose the right size for your puppy High-quality materials: Four ways stretch design with high quality, wear resistant, to bear or endure dirty, have cute pet paw embroidery, soft and hand washable, fashionable yet durable. Durable soles, tough anti-slip sole provides stability and traction, helps dogs with mobility and stability on tile and the sand. 3M reflective strap, microfiber nylon reflective webbing rubber outsole for small to large dogs Comfortable: Skin-friendly waterproof nylon fabric. Soft to paws, so allows the boots to be used indoors or outdoors, hot and cold in wet and dry conditions. Protection from sharp thorns and hot pavement. Effectively protect dog claws from heat, stones, glass, etc. It protect the weak paw from rainy day, snow, ice, salt during winter Safe and Adjustable: Easy to put on / off, the dog shoes are fastened firmly by straps, which are long and adjustable, capable to prevent slipping off and supply a customized tightness for secure closure and have reflective straps, reflective lines enhance visibility all the night, also make your love dog safe. Please try to tighten the straps after wearing, which can effectively prevent the shoes from falling off the dog's claws New friend dog shoes: Don't worry when your dogs start to walk with new dog shoes but not in a normal pace even prance. You can try to encourage and guide your love dog to adapt to Hcpet dog boots Multi-purpose: 1. These boots can keep the dog's paws warm and dry in cold winter. 2. It can protect the dog's paws from being burned in the hot summer. 3. It can prevent dogs from scratching carpets or wooden floors 4. It can protect the dog's paws from injury from stones, asphalt, grass, etc. while walking. 5. It can keep the dog's paws clean and dry on rainy days. Measure method:1) Place the pet's paws on a piece of paper and press down on the top, mimicking how the paw spreads when the dog is walking.2) Measure the paw length and width, mark the left and right sides on the paper, and measure the distance between the marks. Choose a size according to the width is better. Warm tips: Don't worry when your dogs start to walk with new shoes but not at a normal pace, even prance. You can try to encourage and guide your love dog to adapt to this new friend - shoes. Though the boots are waterproof, the dog boots cannot be used in deep water or on sand, because water or fine sand may seep through the sewing needle holes.