A good chicken health check takes only a few minutes per bird and most of its value comes from the order: watch first, handle second. Chickens are flock animals that mask weakness until they cannot, so the bird that is already standing puffed in a corner with her eyes half closed has been telling the flock something for days. A calm, hands-on pass once in a while, done the same way each time, catches the earlier, quieter version of almost every common problem.
Watch the hen before you pick her up
Start by simply observing. A healthy hen is upright, bright-eyed and busy, scratching, dust-bathing and keeping up with the flock, with a comb that stands up in a laying bird and shows a good red colour. Note any hen that hangs back at feeding time, sits hunched with feathers fluffed, or has a pale, shrivelled or bluish comb. Watch her walk: limping, reluctance to bear weight, or sitting on her hocks rather than standing all deserve a closer look at the feet and legs when you handle her.
The hands-on pass: comb, crop, keel and vent
Catch the bird calmly, ideally from the roost in the evening or with a quiet corner approach, and hold her securely against your body. Check the eyes for clearness and brightness, the nostrils for discharge, and the beak for alignment. Run your fingers through the feathers around the vent and under the wings, feeling for the tiny moving specks and gritty clusters that betray lice or mites, and look at the skin for redness or scabs. Feel the crop at the base of the neck: in the morning it should be fairly empty, in the evening comfortably full and soft rather than hard or sour-smelling. Then feel the keel bone down the breast; you want a covering of muscle either side, not a sharp ridge with hollows, which means the bird is losing condition however well she seems to eat.
Part the feathers at the vent and check that the area is clean and the skin pale and unbroken, and glance at the droppings in the house or under the perch for an idea of what the flock is producing. Finish with the legs and feet, looking for raised, crusty scales, swelling under the foot, overgrown nails or spurs, and any cut that has packed with dirt.
Finish by timing the whole flock rather than the individual bird once in a while: how long the feeder stays busy, whether every hen comes out of the house promptly in the morning, and whether egg numbers and shell quality hold steady. A slow flock-wide dip in laying, or shells thinning across several hens at once, is a health and management signal no single-bird check can give you, and it often appears a week or two before any individual hen looks ill. Catching it at that stage is the difference between adjusting the flock's care and treating a bird.
Turning a quick check into flock knowledge
Any hen that is off her feed, breathing with an open beak or audible rattle, has discharge from the eyes, cannot stand, or has lost obvious condition should be separated into a quiet, warm spot and given veterinary attention, promptly if she is dull or struggling to breathe. For the rest of the flock, the check's real power is repetition: birds whose keel feels thinner month by month, or whose comb pales slowly, are found by comparison, not by crisis. Writing the date and findings for each checked bird in KinsLe in the Pet Passport gives you that comparison at a glance.