Of all the animals in this series, the Shetland may be the easiest in which to miss dehydration entirely. It is tiny, famously hardy, covered for much of the year in a coat like a doormat, and round by design, so neither weight, shape nor demeanour changes early in the obvious ways. Add the breed's stoic island temperament, and you have a pony that can be meaningfully short of fluid while looking, to a fond owner, completely fine. The answer is a hands-on routine and a written baseline.
Feeling what the coat hides: gums and skin
Part the hair and use your hands. Lift the Shetland's lip and touch the gums: they should be moist and slippery, and a dry, sticky feel, where the surface drags on your fingertip, is a genuine early sign in a pony whose coat tells you nothing. Press the gum briefly and watch the colour return, noting a sluggish refill. For the skin test, pinch where the coat allows a fair read, on the neck or the eyelid, and judge the return rather than the size of the fold: hydrated skin flattens at once, dehydrated skin in a Shetland creeps back and can hold a small ridge briefly under the hair. Look at the eyes in profile for the slight sinking and dullness that changes the pony's whole expression, since the face is the one place the coat does not cover the truth.
Behaviour and droppings in a stoic pony
Because the Shetland endures quietly, its behavioural signs are muted versions of other horses': standing apart a little, grazing with less determination, lying down at odd times, losing interest in the gate routine and the treat pocket it normally raids. None of these alone proves anything, which is exactly why they must be weighed together with the hands-on findings. Droppings, by contrast, are blunt: a dehydrated Shetland passes fewer, smaller, noticeably drier balls that crumble rather than hold together, and its urine reduces and darkens. In winter, when a thick-coated pony is rarely seen drinking and water may freeze unnoticed for hours, a daily glance at droppings and a weekly hands-on check catch what the eye at the gate cannot.
Group living adds one Shetland-specific water risk: in a mixed herd, the smallest pony is the one most easily kept away from a single trough by larger horses, and the one least able to reach into a deep one. Watch the pony drink a full drink at least sometimes rather than assuming access equals intake, and provide a low, pony-height water point in any field a Shetland shares with bigger animals. Many a mysterious Shetland dullness has resolved into nothing more complicated than a pony that had been politely thirsty for a week.
Small pony, serious timelines
Offer clean, unfrozen water and let the pony drink steadily, and contact your veterinarian the same day when dry gums and slow skin return appear alongside reduced droppings or urine; treat a Shetland that will not drink, is weak or wobbly, breathes fast at rest or seems distressed as an emergency, because a small body reaches the end of its reserves sooner than a large one. Prevention is trough diligence: breaking ice, scrubbing slime, and confirming the smallest pony in a group can actually reach and use the water. Recording those checks and each pony's normal gum and skin feel in KinsLe in the Pet Passport gives you the comparison a thick coat refuses to provide.