Read a Friesian's crest and ribs before the barrel fools you
A Friesian horse shows overfeeding first in the crest and over the ribs, not in the silhouette. That arched, heavily maned neck looks impressive by design, so learn to feel it: a crest that has grown thick, firm, and heavy enough to wobble or lean as the horse turns is storing fat, not just Friesian presence. Over the ribs, press firmly with a flat hand. On a correctly fed Friesian you can feel ribs with honest pressure under a thin, smooth layer; if you have to push hard to find them at all, the ration is ahead of the workload.
Check the tailhead and behind the shoulder in the same session. Surplus rounds the tailhead until the bones there are cushioned in softness, fills the area behind the shoulder blade, and can give the back a flat, table-like look through the loin. Photograph the horse standing square from the side and rear on the same surface each month, because the Friesian's black coat and abundant hair make gradual gain almost invisible day to day, and a dated photo series catches what familiarity misses.
Respect how thrifty a Friesian metabolism can be
A Friesian horse was shaped by modest northern pastures, and many individuals maintain or gain on rations that would leave a Thoroughbred looking lean. That thrift is the central fact in answering this question: if your Friesian is in light to moderate dressage or driving work and still gaining, he is almost certainly eating more energy than he burns, most often from rich pasture, generous hay, and a concentrate added out of routine rather than need. Weigh a day's forage honestly, including an estimate of grazing time on lush grass, before blaming anything else.
Look for the supporting signs of surplus in a Friesian. A horse who leaves little hay but still gains, whose droppings stay normal while condition climbs, and who is bright but increasingly sluggish to warm up under saddle is usually a horse with too much coming in. Restlessness alone does not prove overfeeding, but rising condition on unchanged work is the clearest signal you will get.
Watch the feet and the warm-up as surplus builds
Extra weight on a Friesian horse is not merely cosmetic, so connect feeding checks to soundness checks. Ask your farrier whether the hooves are flaring or the soles look stressed, and note whether the horse warms up stiff, trips more on the arena surface, or breathes harder than usual for the same schooling session. A Friesian carrying surplus works harder at the gaits he is known for, and that effort shows in recovery: longer blowing after work and a slower return to a resting breathing rate at the same fitness level deserve attention.
Because a cresty, easy-keeping Friesian is exactly the profile vets watch closely, raise persistent gain with your vet even if the horse seems well. A crest that becomes hard and lumpy, reluctance to move, or a short, tender-footed stride on firm ground should be reported promptly rather than answered with a harsher diet you design alone.
Reduce a Friesian ration in forage-first steps
Bringing a Friesian horse down starts with the forage audit. Weigh hay, consider soaking or a slower feeder if your vet advises it for this horse, and manage grazing time on rich pasture rather than letting turnout hours expand unnoticed in spring. Concentrate, if he gets any for light work, is the first candidate to shrink or remove, since a thrifty Friesian rarely needs a full bucket to do moderate work. Keep movement daily, recheck crest, ribs, and a weight tape after a few weeks, and adjust in small steps toward ribs you can feel with moderate pressure.
Make the new amounts a yard-wide rule, because Friesians inspire treat-giving — carrots and handfuls from admirers add up on a thrifty horse. Setting the weighed hay, the grazing window, and the weekly condition feel as assigned tasks in KinsLe through Care Teams gives every handler the same numbers to follow and a timestamped record of each check.