Fetlock Boots: What They Do and When to Use Them

Last updated: May 20, 2026

By: Miles HenryFact Checked

Fetlock boots are one of the most misunderstood pieces of leg protection in the barn. Riders put them on the wrong legs, confuse them with tendon boots, or skip them entirely because they are not sure what problem they are actually solving. After 30 years managing Thoroughbreds and Quarter Horses, I’ve seen that confusion lead to preventable injuries more times than I can count — and it usually comes down to not understanding what the boot is designed to do or where it goes.

What Fetlock Boots Do and Why Horses Need Them

The fetlock is the joint where the cannon bone meets the pastern. On the hind legs, this joint sits directly in the path of brushing interference — when one hind leg swings through and strikes the inside of the other. The result is bruising, swelling, skin damage, and in repeated cases, soft tissue injury that can cause lameness. Fetlock boots place a hard protective shell between the two points of contact before that impact reaches the joint.

The fetlock joint also serves as a shock absorber, compressing under load and returning energy through each stride.

A bruised or swollen fetlock joint does not compress cleanly, which changes the horse’s gait and puts secondary stress on surrounding structures — the pastern, the suspensory ligament, and the tendons above the joint. Preventing the initial brushing injury with a properly fitted boot is far simpler than managing the cascade of problems that follows a joint that has been repeatedly struck without protection.

Types of Fetlock Boots

There are two main designs of fetlock boots, and choosing between them depends on your discipline and the severity of your horse’s brushing. Understanding what each design does — and does not — protect against is how you match the right boot to the actual problem.

Fetlock boot types — open-front vs all-purpose

Feature	Open-Front Fetlock Boots	All-Purpose Fetlock Boots
Front coverage	Open — front of joint exposed	Fully enclosed — 360° coverage
Pole awareness	Yes — horse feels rail contact	Reduced — less feedback from contact
Best for	Show jumping competition	Training, trail riding, non-jumping disciplines
Brushing severity	Moderate — adequate for most competition horses	Severe — better for horses that hit themselves hard
Shell material	Hard outer shell, padded interior	Hard outer shell, full circumferential padding
Common materials	Leather (competition), synthetic/neoprene (training)	Neoprene, synthetic, or leather

Open-front fetlock boots are the competition standard in show jumping. The open front is not a design flaw — it is a deliberate training tool. When a horse clips a pole with an unprotected front of the leg, it feels the contact and learns to snap its legs up more carefully. Covering that surface removes the feedback loop. For horses that only brush at speed during competition, open-front provides adequate inside-joint protection without sacrificing jumping technique.

All-purpose fetlock boots wrap the entire fetlock joint and are more appropriate for horses that brush during slower gaits, trail riding, dressage, or horses with severe enough interference that the inside padding alone is insufficient. If a horse is drawing blood or leaving consistent marks on the inside of the fetlock at a walk or slow trot, the full circumferential coverage of an all-purpose boot provides better protection than an open-front design.

How to Tell If Your Horse Needs Fetlock Boots

Not every horse needs fetlock boots. A horse with correct conformation that moves straight and clean through the hind legs at every gait may never make hind leg contact regardless of the work intensity. The decision should be based on your specific horse’s movement pattern and the evidence left on the legs — not on what other horses in the barn are wearing.

The most reliable assessment is a straight-line trot evaluation on a firm, flat surface. Watch from directly behind as the horse trots away from you. The hind legs should swing through in clean parallel tracks without the inside surfaces coming close to each other. Any deviation — a slight inward swing, a wide hip pushing the leg toward the midline, or an inconsistent flight path — is a signal that brushing contact is likely at faster work speeds even if you cannot see contact at the trot.

For jumping horses, putting fetlock boots on the hinds as standard practice is reasonable regardless of observed brushing. The speed and energy of takeoff and landing create contact opportunities that do not exist at slower gaits, and a horse that moves cleanly at the trot can still brush during a sustained jumping session. For more on matching the right boot to your horse’s specific movement pattern, the complete guide to horse boots covers gait assessment and protection decisions by discipline.

Choosing the Right Size Fetlock Boot

Most fetlock boot manufacturers use a three-category sizing system based on the horse’s overall body weight and build. This system is not precise by individual leg measurement, but it works reliably for the vast majority of horses because fetlock boot fit is primarily determined by the circumference of the cannon bone just above the joint, which scales predictably with body size.

Fetlock boot sizing guide by horse weight and build

Size	Horse Type	Approximate Weight	Examples
Small	Light horse, pony	Under 900 lb	Arabian, pony breeds, small Quarter Horse
Medium	Average horse	900–1,200 lb	Thoroughbred, standard Quarter Horse, Paint
Large	Heavy horse, warmblood	1,200 lb+	Warmblood, Draft cross, large stock horse

When in doubt between two sizes, try the larger size first. A fetlock boot that is too small will gap at the straps and may cut into the pastern below the joint. A boot that is slightly large can be adjusted with strap tension, while a boot that is too small cannot be made to fit correctly regardless of how it is applied. Always check the manufacturer’s sizing chart before ordering — shell shape and strap length vary between brands, so a medium from one manufacturer may fit differently than a medium from another. After fitting, run the one-finger check: you should be able to slide one finger between the boot shell and the horse’s cannon bone. Any tighter risks compression injury; any looser allows grit to work under the boot.

How to Put On Fetlock Boots Correctly

Fetlock boots are among the simpler leg boots to apply, but the steps matter. A boot applied incorrectly — wrong orientation, straps in the wrong direction, or grit trapped underneath — can cause the kind of skin abrasion or compression injury you were trying to prevent. Follow this sequence every time.

Step 1 — Secure the horse

Tie the horse or have someone hold it. For a horse being introduced to boots for the first time, a calm environment and a brief desensitization — letting the horse smell and touch the boot before application — prevents spooking during the sliding step. Fetlock boots do not hurt, but the unfamiliar sensation of something wrapping a lower leg can startle a young or inexperienced horse.

Step 2 — Brush and inspect the leg

Brush the hind cannon bone and fetlock area clean before every application. Any dirt, sand, or grit trapped between the boot and the skin becomes an abrasive that works deeper into the skin with each stride — the same effect as running with a stone in your shoe, but over a joint that bears significant impact load. Also wipe the inside of the boot shell clean. A boot that dried with arena footing inside it from the previous session will cause skin damage immediately.

Step 3 — Position and slide

Open the boot and orient it correctly: the teardrop-shaped padding faces rearward and the straps face outward. Hold the boot above the fetlock joint, settle it against the leg, and slide it down in one smooth motion until it seats around the joint. Do not slide it back up if you miss the position — sliding upward brushes the coat the wrong direction and holds it there under the boot, which is uncomfortable for the horse and can cause rubbing. Take the boot back to the starting position above the joint and slide down again.

Step 4 — Fasten straps top-down

Fasten the top strap first, then work downward. This locks the boot’s vertical position before the lower straps set the tension. Straps should be firm — no movement or jingle when you tap the boot — but not so tight that you cannot slide one finger between the top of the boot and the cannon bone. Over-tightening the lower straps is the most common fitting error; it restricts the pastern’s range of motion and concentrates pressure on the suspensory branches directly above the fetlock.

Step 5 — Do the trot test

Walk and trot the horse for 30 seconds on a straight line before beginning any real work. Watch for any boot that shifts position, rotates, or rides up the leg. A boot that moves at a trot will move more at canter and jump speed, and by then it has lost its protective position over the joint. Adjust any strap that allows movement before proceeding. After the session, remove both boots immediately, press your palms flat against the fetlock joints, and check for heat or swelling.

Fetlock Boots vs Tendon Boots

Fetlock boots and tendon boots are often discussed together because they are used as a pair in show jumping — but they are different boots, go on different legs, and protect against completely different injuries. Confusing the two is the most common mistake new jumping riders make when outfitting a horse for the first time.

Fetlock boots go on the hind legs and protect the fetlock joint from hind leg brushing interference. Tendon boots go on the front legs and protect the superficial digital flexor tendon on the back of the front leg from hind hoof strikes on landing. In jumping, using one without the other means one leg pair is unprotected. For a full breakdown of how the two boots differ structurally and when each is needed on its own, the tendon boots vs fetlock boots comparison guide covers every scenario including non-jumping and discipline-specific use cases.

FAQs: Fetlock Boots for Horses