I have a salmon Faverolles that has been sneezing consistently for the past 6 months or so. She is only about a year old. Other than the consistent sneezing she seems healthy and lays consistently, but she sneezes and shakes her head several times per minute. They coop and run is not dusty and the other chickens sneeze only rarely. Anyone have experience with something similar? She actually has been seen by a vet but of course wasn’t sneezing when he saw her and he felt nothing was wrong.