Good day. 1 of my chickens is sick with a respiratory problem. She has been sick for 4 days. I've been giving her .5 ml of tylan 50 1 time a day in the back of the neck but I kept reading more help pages and I thought it would be best to up the dose to 2 doses yesterday. She is still wheezing, difficult to breath and a runny nose. I'm thinking about taking her to the vet tomorrow morning because she isn't showing signs of much improvement.