Few weeks ago I had chicken I believed had Canker. Treated and all better.. now I have another sick one but different symptoms. This chick I noticed night before drooling.. I brought in and gave her metronidazole. (Thinking maybe canker since contagious). Today she still inside has not eaten and is worse. Head tilted to side, raspy labored breathing. I checked her over I don’t feel anything unusual but not sure I know what would be unusual. I attached some pics. Also I noticed little clumps of I believe poo directly under vent attached to base of feathers . Any ideas.??