Horse anatomy
Fetlock
The joint above the hoof. Bends with each step to absorb impact.
A closer look
The fetlock is the rounded joint at the bottom of the cannon bone, just above the pastern, where the lower leg bends with each step. It connects the cannon bone to the long pastern bone. People often call it the horse's ankle, but it actually matches the big knuckle at the base of a human finger or toe. Two small sesamoid bones sit at the back of the joint.
Why it matters
The fetlock flexes and sinks each time the leg takes weight, working like a spring to absorb impact. That makes it a hard-working joint, and swelling or heat here is a common early sign of strain.
Care tip
Feel the fetlocks when you groom and compare left with right. On horses with long hair here, called feathers, part the hair to check for mud, scabs, or irritated skin.
Common mistake
Calling the fetlock an ankle is common, but it can cause confusion when you talk to a vet or farrier. Using the correct names helps you describe problems clearly.
Fun fact
Many horses have a small, hard bump called an ergot on the back of each fetlock.