So I have a little flock of silkies, one of the young hens sneezes, not often perhaps 3-4 times a day. Other than that she is happy. I have ordered some vetrx to see if this will help clear it up however I wondered what the best way to use is, it seems you can add to water, rub on top of beak, put on top of the head or under wing and also give a direct dose. Seeing other threads about this it’s sounds like more of an oil than a liquid, will it damage the feathers if put on her head??? Any advice