Hi, I posted yesterday with symptoms my hen was having and didn't get any suggestions except possibly gape worm. I heading that direction as this morning, (she's still alive thank goodness) she does seem to be stretching her neck to gulp air. I have two questions....1- If I treat her for gape using fenbendazole, Valbazen or Ivomec what would be the dosage and which one would be the most effective? 2- Must I treat the whole flock? I guess I have a third- should I do anything to the coop and run area? I thank you for your answers in advance. If it weren't for this forum I would be lost with my chicken questions!