I have an 100lb Alaskan Malamute and I bought size 8 for him and it fits his giant paws very well! These stayed on and are very durable!!! I have gotten other shoes before and after one walk, there was already a hole on the bottom.... But these shoes have rubber soles and are just perfect for my big guy!
Finally boots that stay on. Bought the small for my 20 lb. Cavachon. They are easy to put on and with double Velcro straps, they stay on. My dog wouldn't move at first but with a little practice in the house he can now run in them. Best of all, his feet stay dry and clean