Practicable Reference Size of Large: L 3.15" x W 2.83". Lonsuneer soft dog boots are reliable paw protectors for dogs, capable to protect paws indoor and outdoor, and also suitable for bandages. The boots are comfortable, flexible, lightweight and hand washable. Please measure across the whole paw pad to get the measure of paw width and length. These boots are relatively flexible and roomy, so a snug fit is better. If your dog's paws are in between 2 sizes and if you've chosen the larger one, you could kindly try to use socks for dog inside the boots and then the boots may stay on better. Kindly Attention: Though the soles are waterproof, the boots can't be applied in deep water or in heavy rains, because there may be water seepage through sewing needle holes or through mesh fabric.