I have a rescue that has roars, I believe, that just developed 3 months ago.  Any idea on a place that can evaluate and possibly do surgery.  She is a MFT and I absolutely love her!!  Blue Roan with Chrome!

I would start with an equine veterinarian that can scope the upper airway and determine the cause of airway noise. Im not familiar with your area, so i dont have a suggestion of who to go to.