The Pekin signs that show first
A dehydrated Pekin duck shows sunken, dull eyes, unusual stillness, and a loss of interest in water long before collapse. A healthy Pekin is busy, bright-eyed, and constantly dipping its orange bill, shaking water through its white feathers, and dabbling as it eats. A Pekin short of fluid often sits hunched away from the flock, keeps its bill closed or slightly open, and stops preening, so the normally sleek white plumage looks ruffled and dirty around the head and nostrils.
Look closely at the bill and mouth of a Pekin you are worried about. The bill may feel dry rather than cool and moist, and saliva can look thick or stringy when the bill opens. Droppings that are normally loose and messy become small, dark, and dry. Appetite falls because Pekins wash food down with water, so a bird that approaches feed but turns away, drops pellets, or stops foraging has a clue that points back to drinking, not just hunger.
Why Pekins run into trouble quickly
Pekins need water for far more than swallowing. A Pekin duck must be able to submerge its whole head to keep its eyes and nostrils clean and moist, and without that dipping water the eyes can look crusted or foamy and blinking slows. A shallow drinker that suits chickens, a bucket tipped over by a heavy Pekin body, or a frozen surface on a cold morning can therefore leave a Pekin functionally without water while a drinker still appears partly full nearby.
Heat adds a second pressure on a Pekin. These are large, fast-growing birds with a thick layer of body fat under dense feathers, and they cool themselves by panting, splashing, and seeking shade rather than sweating. On a warm afternoon a Pekin that cannot reach a pond, kiddie pool, or deep trough will pant with its bill open, hold its wings slightly away from its body, and drink greedily and for an unusually long time once water is finally offered.
What to do for this Pekin now
Give a dehydrated Pekin duck calm, immediate access to clean water deep enough for full head dipping, and watch whether it actually drinks. Place the vessel somewhere level where this heavy bird does not have to climb or compete, refresh it if it is fouled, and offer a second dipping source in shade so flock mates cannot guard the only supply. Wet feed offered as a soft mash can tempt a Pekin that is reluctant to tackle dry pellets, but water itself comes first.
Do not tip water into the bill of a weak Pekin or force the head under. A bird that is too dull to hold its head steady can inhale fluid, so keep the water at a comfortable height and let the Pekin choose the pace.
When a Pekin needs a vet promptly
Contact a vet promptly if a Pekin duck cannot or will not drink once clean dipping water is offered, if the eyes stay sunken, or if weakness and stumbling appear. A Pekin that collapses, breathes with effort at rest, produces almost no droppings, or fails to brighten within a short period of drinking needs same-day advice rather than another wait-and-see round. Ducklings and Pekins that have also stopped eating need help sooner, because their reserves are smaller and decline is faster.
Write down when this Pekin last drank freely, last swam or dipped, last ate, and what its droppings changed from, because that sequence helps a vet separate simple water shortage from illness that stopped the bird drinking in the first place. Keeping that dated Pekin timeline in KinsLe alongside its other health notes, through Pet Passport, means anyone caring for the duck can hand the vet the full picture in one go.