|Canine physiology protects dogs' feet to temperatures|
as low as minus 31 F.
What keeps your dog's feet from freezing?
A team of scientists figured out that dogs have special blood vessels in their paws that protect them from cold. Using electron microscopes they found that heat was transferred from the artery in the dog's pad to a network of veins where the blood is warmed up before it returns to the body. This in turn prevents the feet from cooling down. Dog's paws are kept at a constant temperature in cold weather.
Read more in BBC Nature News.