A very thin rescue horse tempts everyone to feed generously at once. Resist it. A gut and metabolism adjusted to scarcity can be overwhelmed by sudden rich feeding, and the horses that gain best are re-fed in stages over weeks and months. The routine below builds condition on forage, patience and measurement rather than on big buckets.
Rule Out the Non-Feed Causes First
Before calories go up, get a vet to examine the horse, including its mouth. Sharp or missing teeth make chewing hay painful and inefficient, and a horse that drops half-chewed wads of hay is telling you exactly why it is thin. Ask about a faecal egg count so worming targets what is actually present, and about blood work if the horse is elderly, dull or drinking excessively. Many rescue horses gain noticeably once teeth are floated and a real parasite burden is dealt with, on the same hay that previously seemed inadequate.
The First Days: Little and Often
For a horse in very poor condition, the opening pattern is small forage meals spread through the day rather than a mountain of hay at once — typically good-quality grass hay offered in modest amounts every few hours for the first days, as your vet directs for that horse's state. Keep clean water constantly available and watch that the horse is actually drinking; check droppings are forming normally and the horse is bright between meals. Sudden large grain meals have no place in this phase at all.
Building the Forage Base
As the horse stabilises, increase hay steadily toward free access, aiming over time for forage around one and a half to two percent of bodyweight daily as a working guide, adjusted to the individual. Weigh hay in a net or bucket occasionally so "a big pile" becomes a known quantity, and use slow-feeding arrangements if the horse bolts its ration then stands empty for hours. Add a plain salt source and shelter from wet, cold weather, because a thin horse burning calories just to stay warm will not gain no matter what the bucket holds.
Concentrated feed, if the vet agrees it is needed, comes after the forage base is established: small amounts, split into two or three meals, increased in tiny steps over weeks, never in response to one disappointing weigh-in. Any change — new hay batch, new feed — is made gradually over several days.
Measure Condition, Not Hope
Score body condition by hand every two weeks — ribs felt with light pressure but not staring, cover building over the back and hindquarters — and take a photo from the same side, in the same light, on the same day you score. Use a weight tape on the same spot for a trend line. Daily looking is useless; fortnightly records show the slow, safe climb you want. Expect months, not weeks, for a genuinely thin horse, and plateau-check with the vet if a month of correct feeding produces no movement at all.
Who Feeds What, Written Down
Rescue yards run on helpers, and refeeding fails quietly when two people each give the extra meal. Assigning each feed, hay weigh and condition check in KinsLe's Care Teams, with completed tasks timestamped, keeps the staged plan exact — one ration, given once, by whoever was on duty.