Does your dog have a little “thumb” on its leg? What that’s for..

If you’ve ever wondered why dogs have an extra pad, like a little thumb, on the back of the leg, it’s an evolutionary leftover.

It’s called the carpal pad. Puppies are born with a dew claw there, sort of like an extra toe, but many have that removed. 

Your dog’s ancestors had four, more pronounced dew claws and carpal pads which helped them climb, tear and hold their prey. With evolution, most breeds lost them from the hind legs but can still use them on the front for added balance when running or turning, or for added grip with that chewable toy.