Hi, I lurk around here a lot almost everyday. I am new to chicken keeping and learning a lot from this site. I have 4 chickens (2 red production, 2 black sex links) they are 7 months old. They do not free range as there are too many dogs around us. I noticed today Daisy was shaking her head every 15 seconds or so.(then later not as much) I picked some grass to hand feed them and daisy did not come to eat. She was just standing off to the side. They always come running for grass. I picked her up and checked for mites or lice all over and saw nothing. Her vent looked good. Her crop was empty though. I tried everything to get her to eat. She would only eat live mealworms. I am really worried about her not eating as I've heard chickens can go downhill quick. She seemed slightly bony compared to the others. I have not seem any other symptoms like sneezing, running nose, haven't noticed any unusual or runny poop. Clean there coop daily since I use sand. They all have been healthy all this time and usually get 3-4 eggs daily. This is the first day I've noticed anything unusual. I hope someone has some advice. I have tried searching and can't find what to do. I can not separate her as I have no where to put her. Please help! Update: went out with a flashlight to check again for mites. And daisy went to the feeder and was eating so I will sleep a little better tonight.