Try to get him to drink some fluids by dipping his beak into water and letting him swallow. Add electrolytes and dip his beak as often as you can several times an hour. Feel of his crop, the pouch on his upper right chest to see if it is flat, or round and hard. Chicks can eat their bedding, and get an impacted crop. This can cause them to starve to death. Do you have him under a heat lamp with a thermometer reading about 90-95 degrees on the floor? Check his butt or vent for dried poop or pasty butt, and remove it with warm soapy water if seen. Some chicks at feed stores may not make it due to the stress of being shipped in the mail, getting cold or dehydrated. Sometimes when symptoms are moticed, it can be too late, but still worth trying. I hope that you can save him.
