A hen is shaking it's head side to side in a circular pattern, what could be wrong? She is also opening her mouth, kinda yawning-like. She chatters too, but not to talk. I also noticed tiny white, slender bugs. Do I use Seven Dust for the bugs? How do I dust them....because when I dust my dogs with DE, they just shake it off and none is really on them anymore... What do I do about the other issues?