I bought my 6 month old weanling filly about a month ago. About two weeks ago I noticed she had a snotty nose, it’s been two weeks and she still has is along with some light coughing. She is stalled at night and let out during the day so I don’t think it would be from dust. I live in Missouri where one day it could be snowing and the next day 60° out so maybe just the weather? She is up to date on worming and vaccinations. Has anyone else seen this in their weanlings and if so have you given any medication?