Desperately need help with my poorly boy!
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How old is he? I would try to bring him inside the hose for warmth tonight. Check his skin for evidence of mites or lice. Feel of his crop for any impaction (fullness) or food present. Feel of his keel bone (breast bone) to feel if he has lost weight. If he is rather young (under 20 weeks) coccidiosis could be a problem. Do you worm your chickens? If you can get him to drink some electrolyte solution ( or put a pinch of salt and 1 teaspoonful (5 gm) of sugar into a liter of water, and see if he will drink or you can give it with a dropper. Most chickens will eat a chopped egg if have any appetite at all.
Edited by Eggcessive - 12/14/15 at 3:40pm