Apparently it wasn't the heat itself that got to my little silkie, it was that he was raised on chicken nipple waterers and had forgotten how to drink from open water. I have dipped his beak in the water but still have not seen him drink. I am continuing to watch him.They are barbless feathers.
I live in a temperate area. PNW. We sometimes get high 80's and rarely 90's summertime weather. I have a silkie flock of around a 75 birds and a flock of smooth feathered (barbed feathers) around 20. I see no difference in their ability to stay comfortable. All free range and spend the heat of the day in the shrubbery. All have access to cool water and shade at all times.
I didn't stop to think how they will fare in the winter. We have been getting snow every winter since we have been out here, 12 years. Sometimes enough to make it hard to get out of the driveway. Do Silkies do ok in winter and snow? Do I need to do more in my coop for winter?Acv can dehydrate them further, try giving him sugar water, the sugar should make him drink more as well as giving him a little energy. They can deal with hot temps as long as they have enough cool shade and cold water, they dont do so well in the wet though, their feathers clump together Luke human hair and they can't stay warm, which is when they get hypothermic, sick and die. So a rain free place is great in winter and if it's tin or something then it can make shade in summer . good luck for your baby silkie