A handful a day is the honest measure
Horses did not evolve around concentrated sugar and starch arriving in pockets, and a treat habit grows quietly: one carrot at catching, one at tacking up, two because he was good, more from the neighbour at the fence. Each giver sees one treat; the horse eats fifteen. As a working allowance for an average horse on a normal forage-based diet, keep the day's total to a small handful — roughly what you can hold in one cupped hand: a few baby carrots, a small apple cut into pieces, or a couple of purpose-made treats. That is enough to reward, greet and bribe with, without the extras becoming a meaningful part of his sugar intake.
Which treats suit horses, and how to serve them
Carrots and apples are the classics, and both are fine in the handful quantities described, cut lengthways or into small pieces so a greedy horse cannot bolt a whole chunk. Bananas, a few grapes, celery and purpose-made low-sugar treats all work as variety. Feed whole or large hard items with care to a horse who snatches, and skip anything mouldy, slimy or fermented from the bottom of the feed room. However innocent the item, it belongs in the day's handful, not in addition to it — including the mints in your coat pocket and the treats handed out by everyone else who loves him.
Feed from a bucket, not your palm
Hand-feeding teaches horses that hands, pockets and fingers are where food lives, and the lesson escalates predictably: nudging, pocket-nipping, then a genuine nip at a child's hand that was only waving. If your horse is already mugging people for treats, move all treats into a bucket or onto the ground for a while and let hands become boring again. Treats also work better as training economics when they are occasional rather than constant — a horse rewarded with a piece of carrot for a genuinely good effort notices it; a horse rained with treats for existing barely registers any of them.
The horses who should mostly skip treats
For some horses the answer to 'how many' is close to none, and it is not cruelty but care. Overweight horses, cresty easy keepers, and any horse with a history of laminitis, equine metabolic syndrome or Cushing's disease are managing exactly the sugars that carrots, apples and mints deliver. A scratch, a handful of their own forage pellets, or a low-sugar treat made for such horses keeps the ritual without the risk. This is vet territory: if your horse is in that group, ask your vet what, if anything, belongs in his treat allowance, and then make sure the whole yard knows the rule.
Treats never fix a ration gap
One final distinction: treats are entertainment, not nutrition. If a horse is dropping weight, a handful of carrots is not a feeding plan — that is a ration review and possibly the dentist and the vet. Conversely, a horse in perfect condition on forage alone is not missing out because his treat count is modest. Keep treats small, counted and deliberate, and they stay what they should be: a pleasure for both of you, not a second diet.
Agreeing the day's handful and writing it into the horse's feeding duty in KinsLe's Care Teams means everyone who handles him can see the allowance and whether it has already been given, so the horse gets one handful, not one per admirer.