Ultra Paws Durable Dog Boots Great traction for senior dogs or with hip conditions that have trouble with slippery floors. Flexible, skid-resistant sole performs in wet and dry, hot and cold conditions. Easy to put on with wide split seam top opening  difficult to slip off. Velcro straps for secure closure, with generous foam to cushion the grip. Measure paw width for best fit: Petite 1 , X-Small 1 , Small 2 , Med 2 , Large 3 , X-Large 4 wide. Place the paw on a piece of paper and press down on the top, mimicking how the paw spreads when the dog is walking.<br> Mark the left and right sides on the paper and measure the distance between the marks.<br> Compare this to the boot sizes. The width of the paw should be smaller than the boot size. Loosely fasten Velcro closure<br> Wash in cold water and set to delicate cycle<br> Hang to air dry