The short answer for a Shetland pony
An adult Shetland pony usually needs two small measured meals a day, not a running buffet of rich feed. A Shetland is a native pony built to survive on sparse island grazing, so its body extracts a great deal from very little. For most healthy adults in light work, those two meals are modest: a balancer-style ration or a tiny handful of low-sugar feed to carry minerals, while the real bulk of the day comes from hay. The bucket part matters less than the forage part, because a pony standing for long hours with an empty stomach is a pony looking for trouble at the fence line.
Why a Shetland fills up so fast
A Shetland pony fills up fast because generations on wind-swept, thin grazing selected for an exceptionally thrifty metabolism. The same field that keeps a big riding horse lean can quietly fatten a Shetland, especially in spring when new grass is sugar-rich. Fat on a Shetland hides in telling places: a thick, cresty neck, pads behind the shoulders, and a filled groove along the back. Weighing hay instead of tossing out a casual armful is the single biggest change most owners can make. A small-holed hay net slows the pony down, stretching a modest ration across more chewing hours and mimicking the near-constant grazing the breed's gut is designed for.
A two-meal day that works for a Shetland
A workable Shetland day starts with a weighed morning hay net and the small balancer meal, followed by controlled turnout where grass is limited or a grazing muzzle is worn if the pasture is lush. The evening brings the second net and, if fed at all, the second tiny meal, given at roughly the same times each day so the pony settles into a predictable rhythm. On a yard with several helpers, write the exact net weight on a board by the stable, because 'a slice of hay' means something different to every person who picks up a fork. Rest days need no extra feed for a Shetland in light work; work is paid for with fitness, not with a bigger bucket.
Weight and feet: the Shetland watch-outs
Weight gain in a Shetland pony is not a cosmetic issue, because excess fat and rich grazing are closely tied to sore, sensitive feet in native ponies. Check the neck crest weekly with a flat hand: a crest that feels firm and thickened, rather than soft and slim, is your cue to tighten the hay ration and restrict grazing before lameness appears. Feel for a stronger pulse in the lower leg and test whether the pony is reluctant to turn or steps short on hard ground. Any Shetland that lies down more than usual, shifts weight from foot to foot, or looks pottery on its feet needs a veterinarian promptly, and rich feed should stop while you wait for that advice.
Keeping every feeder on the same Shetland plan
The plan above only protects a Shetland pony if every person feeding follows the same weights and times, and small ponies are magnets for well-meant extras from visitors and children. Agree the two-meal routine in writing, note the muzzle rule for turnout, and make one person responsible for the weekly crest check. When a helper covers a weekend, the pony should get exactly the weighed nets written down, not a generous interpretation of them. With KinsLe, Care Teams can assign the Shetland's morning net, evening meal and crest check to named helpers, each marked complete with a timestamp, so the pony's thrifty diet survives every change of feeder.