I draw the distinction between it being performance enhancing - I see it as rather allowing a horse to perform to its natural ability? I have always regarded performance enhancing to mean making a horse go above and beyond its natural ability??
...
Obviously I am pro lasix, but whenever this discussion crops up, there are always one or two that appear and say it is a masking agent (for other drugs). I guess I'm asking because I've never thoroughly researched lasix as a masking agent (but I find the same people say anything and everything can be masking agents anyway, lol!). There have certainly been a swag of positives with lasix horses for other substances in North America...