Everything distinctive about a Merino — the exceptionally fine, dense fleece, the wrinkled skin that grows more of it, the wool that covers much of the face — cuts both ways. The breed produces superb fibre and, in exchange, needs more deliberate inspection than a plainer sheep. Most Merino health problems start hidden: under wool, inside folds, or beneath a foot nobody has picked up lately. Owners who build their routine around getting hands and eyes under the fleece catch the breed's characteristic troubles while they are still small.
Flystrike in folds and soiled wool
Blowflies lay eggs in warm, moist, soiled wool, and the hatching maggots feed on the skin beneath — a fast, painful process that can kill a sheep while the surface wool still looks almost normal. Merinos are especially exposed around the breech, in belly and neck folds, and anywhere daggy wool holds moisture against skin. The early signs are behavioural: a sheep that stamps, twitches its skin, rubs against posts, goes off alone, stops grazing, or carries a suddenly discoloured, damp-looking patch of fleece. Any struck sheep needs immediate attention — clipping the affected wool away, removing maggots, and veterinary help when the area is large, deep, or the sheep is dull or off its feed. Prevention is routine rather than dramatic: keep breech wool crutched short, shear on schedule, clean up dags, manage droppings-soiled pasture where practical, and walk the flock more often during warm, humid fly weather so a restless sheep is spotted the day it starts.
Wool blindness, eyes, and lamb eyelids
Wool grown over the face can creep down until it physically blocks a Merino's vision, a problem called wool blindness. Affected sheep startle easily, lag behind the flock, bump fences or troughs, hold the head high and tilted, and lose condition because they cannot graze competitively — yet the cause is simply a fleece nobody trimmed back. Keeping face wool clipped clear of the eyes at shearing and between shearings prevents it entirely. Lambs deserve an eye check in their first days, because inward-turning eyelashes scratch the surface of the eye and produce tearing, squinting, and a cloudy patch if missed; a lamb with a wet, half-closed eye needs prompt attention rather than waiting for it to grow out of it. Cloudy eyes, discharge, or a sheep suddenly bumping obstacles in an adult flock should be checked the same day you notice them.
Feet, parasites, and feeding a fine-woolled sheep
Wet ground softens Merino feet and sets up soreness between the toes and under the hoof wall: a limping sheep, one grazing on its knees, or a strong sour smell from a foot all call for the foot to be lifted and examined. Regular foot inspection when sheep are yarded for other jobs is far easier than catching a lame sheep in the field later. Internal parasites show the usual sheep pattern — loss of condition under a bulky fleece that hides it, loose droppings, pale inner eyelids, and in some cases a soft swelling under the jaw — which is why hands-on condition scoring and eyelid checks beat judging by silhouette. Late-pregnant ewes carrying twins need feeding watched closely, since a ewe who goes off feed, wanders from the flock, or seems wobbly and dull near lambing needs urgent veterinary help. A sheep that cannot rise, breathes hard at rest, or has an extensive struck area is an emergency. Keeping each Merino group's shearing, crutching, foot-care, and lambing notes together in KinsLe's Pet Passport means a shearer, helper, or vet can see at a glance which sheep are due and which have struck before.