Tinkerbell - 2016-05-29 11:18 AM  every time a horse is ran & it bleeds there is a chance of lung tissue scarring. Once that happens, it is permanent damage. Lung capacity u don't get back. This is why it is so important to take immediate action if u suspect your horse has bled. Get a scope & get cultures to see why the horse bled. Then u will no what options you have. Lasix is NOT a bad & horrible thing like so many people scream. Even though I have my horses allergies under control, I still would never chance running him w/o his lasix. Lung scarring is by far way worse than the side effects of lasix. As long as the horse drinks aftr & you give some extra electrolytes, there is nothing scary about lasix. Fyi, I have personally seen a horse that was a solid 2d horse end up being no faster than a 4d/5d horse later n it's career due to the new owners NOT giving lasix like they were told to when they bought the horse. They never saw blood so assumed he wasn't bleeding. His lungs are now so scarred, he has no more lung capacity & it ruined the horses career. It's a sad fact. Bleeders r not that hard to deal with.