Slow is the only safe speed
A fat horse is a health problem in progress — extra weight loads joints and feet, strains the heart and lungs in work, and leaves the horse vulnerable when rich grazing arrives — but the correction must respect how a horse is built to eat. Horses are trickle feeders whose stomachs produce acid around the clock, and crash diets built on long hungry gaps trade fat for gut trouble, stable vices and a miserable animal. The target is a steady, almost boring loss that you verify monthly on the tape and under your hands, achieved by controlling what goes in and gently increasing what gets burned, over a season rather than a fortnight.
Forage first: soak it, weigh it, make him walk for the grass
Hay stays at the centre of the plan, but its contribution changes. Soaking hay in clean water before feeding leaches out a meaningful share of its sugars, so the horse gets his essential fibre and chew time at a lower calorie cost; serve it drained, and change the water between batches. Where hay is fed loose and endlessly, start offering measured amounts in small-holed nets so it lasts longer without growing in quantity. At grass, the two proven tools are a well-fitted grazing muzzle — worn for part of the day, with the horse checked for rubbing and drinking — and a track system around the field edge, which turns grazing into walking. Strip grazing with a moved fence achieves the same control for horses who hate muzzles.
What leaves the bucket, and what must stay
The bucket feed is where most slimming plans are quietly undone. Rich conditioning mixes, oils and generous scoops of anything starchy come off the menu entirely. What stays is a balancer or a broad vitamin and mineral supplement at its measured rate, because a horse on restricted forage still needs his micronutrients — cutting calories must never mean cutting the essentials that forage alone may not supply. Treats shrink to the token level: a slice of carrot for catching, not a bag of horse treats emptied by admirers at the fence, which is where other people's kindness needs managing as firmly as your own feeding.
Exercise, monitoring and the vet conversation
Movement is the other half of the equation, introduced at the speed the horse's current fitness allows: regular walking work built up week by week, long-reining or in-hand walks for a horse who cannot be ridden, turnout on the track rather than in a small pen. Weigh-tape and condition-check him monthly, hands on ribs, crest and quarters, and expect the numbers to move slowly — a standstill for one month is a prompt to tighten the grazing or the soaking, not to slash the hay. If a genuine effort over a fair period shifts nothing, if the fat sits in odd hard pads, or if he seems unwell in any way, that is a vet conversation about what might be driving the weight, not a reason to feed less and hope. A plan with this many moving parts survives because it is written down and shared: KinsLe's Care Teams turns the soaking, muzzling, exercise and monthly checks into timestamped duties on your horse's routine, so the slimming programme runs the same on the days you are not the one holding the haynet.