I thought my 4 mo. old filly (beung boarded at the breeder's) was over a cold, but it reared its ugly head again this morning with a snotty nose (white/clear mucous) and slight gurgling sounds when she exhales, and coughing. She isnt the only one that has it, there are at least 4-5 other nearly the same age weanlings, penned separate from her, that have the same symptoms. I had her on some PenG (15 ccs 1x a day for 7 days) and within a few days before her last shot, her nose had stopped running and the gurgling sound cleared up. I had started her on that to prevent infection in her lacerations (on a separate post) via the recommendation of a local vet, who actually wanted me to go 2 weeks at that amt. with the PenG. However, after getting a second opinion from my vet back home, she said that if the pen G hadn't cleared up the symptoms within 5 days of starting that much PenG, that it was viral and it would have to run its course. So its been about 1 to 2 weeks since I quit giving her the Pen G, and the cold is back. I know it isn't strangles, because I have unfortunately had to deal with that in my older horses and these arent the same symptoms. Plus it is only seems to be limited to the weanlings. There are horses of numerous ages (2 yr old and up) stalled within somewhat of a close proximity to the sick weanlings, and none of them are showing symptoms. My question for you all is, should I talk to my vet back home and see if she would suggest me putting her on some SMZ's or other antibiodics to see if that would clear up the cold? Or should I just let it run it's course and watch her?