Finally dog boots that stay on! Muttluks are not just fancy footwear. Made in Canada, Muttluks provide comfort, protection and durability to keep paws healthy. While these boots are very durable, keep in mind that dog boots are like people boots, they wear out. They"ll wear out a lot faster on cement too (yes that"s a picture of our Tilli on cement). Machine washable. Four boots to a package. All Weather Muttluks are designed for 4-season use. Yellow only. Fleece Lined Muttluks are designed for cold season use. Red only. We know from experience that if you don"t pull the Velcro Fastening Strap tight enough these boots will come off. So please, cinch "em down when you get them on! Without proper fit Muttluks won"t stay on your dog properly. There is a very simple way to measure your dog. Start by getting a pad of paper and pen. Now call your dog (or if your dog has you well trained, go get your dog). Place a front paw, that"s important so we"ll say it again, place a front paw on the paper while your dog is standing on it. Hey we didn"t say this was going to be easy! Draw a line at the back of the paw right behind the foot pad and another line right in front of the toe nails. Hmm, you"ll have to go get a ruler now (and you thought internet shopping meant sitting on your behind and clicking a mouse). Measure between the two lines. Size Large: From 3.75" to 4.25".