Additional resources on equine respiratory diseases:
eXtension HorseQuest Article: A Cough and a Wheeze May Signal Heaves
eXtension HorseQuest Article: Disease: Equine Influenza
eXtension HorseQuest Article: Strangles in Horses
eXtension HorseQuest Article: Equine Facilities: Stall Barn Design and Construction