My CF doctor specifically told me no birs growing up, but he may have been a little stricter on this than some. Even this past year when I got an infection while visiting my parents and had to re-visit my pediatric doctor, I said something about my dog and he said "dogs are fine, birds are NOT." Not sure why he mentioned birds since I have never had one nor talked about having one, but he brings it up every chance he gets so he must feel strongly on it, for what that's worth.