My smallest chick's tongue looks ugly, like a human tongue that hasn't been brushed in days. She also has a rather smelly breath, not too foul, but unpleasant. I asked another friend who keeps chickens what it could be, and she mentioned two other possible illnesses, thrust and avian pox. After I read the symptoms I don't think Rusty has either, as she pretty much steals the food from my other chickens when I give them treats, and she runs round and is very perky when she is foraging in the backyard. She does, however, still have some issues swallowing every know and then, she sneezes and shakes her head to expel some piece of food that bothers her, and has excess saliva. She does eat well and empties her crop every night. I've got some raw organic apple cider vinegar that I began adding to their wateter yesterday. The other chicks are ok and show no abnormal tongues or breath. I also read I should give Rusty probiotics in her food and plain yogurt. Well, she won't eat the yogurt yet, and for probiotics, would it be ok to give my chicks probiotics that are meant for humans, like the ones sold in the gnc stores?