What to look for in a hardy little native pony
A dehydrated Welsh pony has gums that feel tacky or dry when you lift his lip, skin on the neck that stays softly tented after a pinch instead of dropping flat, and eyes that appear slightly deeper set than his normal bright, bold look. He will pass less urine, darker in colour, and his droppings will be dry and crumbly rather than the moist, formed balls typical of a pony on grass. The change in character is often the giveaway in this breed: the pony who normally drags a child toward a haynet but who stands quietly in a corner, uninterested, is showing you a sign as real as any test.
Why ponies get missed until they are quite dry
Welsh ponies evolved on sparse hillsides and carry a reputation for thriving on fresh air, so adults tend to assume a Section A, B, C, or D will simply cope. In practice, a small pony in a thick coat can overheat quickly during a long lesson, a gymkhana day, or a hot afternoon travelling in a trailer, and his absolute water intake is small enough that missing even one good drink is a bigger share of his day than it would be for a large horse. Ponies living out in a group can also be quietly pushed away from a single trough by a dominant fieldmate, so the pony who looks fine may simply be the one who never got his turn.
Checks sized for a small head and thick coat
Lift the lip of that small, neat head and feel the gum with a fingertip; slick is normal, sticky is not. Pinch skin where the neck meets the shoulder, choosing a spot you can find consistently through a winter coat, and compare the return with his healthy-day response. Count droppings in his stable or pen over a known period, because pony owners often know this number well from mucking out, and a drop is meaningful. Watch him at the trough or bucket rather than assuming access equals intake, especially in a shared field, and note whether he drinks deeply or just mouths the surface.
Sensible first steps for a pony
Move him into shade, untack him, and offer fresh water in his own familiar bucket, little and often, while he cools. If he lives out, bring him in or separate him briefly so you can actually measure what he drinks and what he passes, rather than guessing from trough level shared with others. Offer his usual forage once he is drinking, listen for gut sounds low on the flank, and write down the times and amounts as best you can. A pony who perks up, drinks well, and produces normal droppings is recovering; one who stays quiet despite the chance to drink needs escalation, not more waiting.
When a pony needs a vet the same day
Call a veterinarian promptly if your Welsh pony refuses water altogether, if the skin tent and dry gums persist, or if he remains dull, lies down more than usual, or shows any pawing, rolling, or flank-watching. Very young foals, elderly ponies, and ponies already being managed carefully for weight or hoof concerns should be discussed with a vet sooner, because their problems can compound each other. Any pony who has had no droppings, or whose breathing stays fast long after work stops, should be treated as urgent that day rather than left to see how he looks in the morning.
Notes that help the next person spot it faster
Record this pony's normal drinking at home, at shows, and in the trailer, how his droppings usually look across the seasons, and the exact spot you use for his skin check so anyone can repeat it the same way. Add the fieldmate situation if trough access turned out to be part of the story. Keeping those details in a KinsLe Pet Passport alongside his vaccination, dental, and farrier history means a loan home, a riding school, or a covering carer gets the pony's real normal in writing, not a guess based on his hardy reputation.