Preface: I did read through some old posts on here, but nothing is very recent. 

What do people like for a daily respiratory supplement for horses that are running on Lasix? My mare has some issues when its really hot and smokey (living in the NW) already so I don't think it would hurt to add something just daily. I use MVP supplements (Exceed 6 way) already, but would like thoughts on Airway Eq. Have used Superwind as well but don't necessarily consider that a daily user. Did some reading on Kentucky Equine Research that recommended their EO3 omega/DHA liquid that sounded interesting but don't know anyone that uses it. Appreciate any insight!

I use Total Health Enhancement Lung Function.  I initially put my bleeder on it after reading testimonials from others using it.  I was pleasantly surprised that after I put my mare on it, her stall cough went away.  She also runs on lasix and I'm scared to stop using that, but I add this supplement as insurance.  It has to do some good for the lungs as her stall cough is gone.

I had great luck with MVP AirWay. I used to give their Breathe paste as well pre-run, plus lasix. He is retired now, but I will use it anytime in the future for a bleeder