When I excercise my horse (specifically lunging) I notice her nose starts to run... is that normal or should I be worried?

It depends on what colour the discharge is. If it is white or clear then it is usually ok. If the discharge is green, or pinky red then you have a problem. It also depends on how thick the discharge is, if the discharge is runny or smooth then it’s ok. But if the discharge is thick or chunky then even if it’s white you have a serious problem on your hands, it doesn’t matter what colour it is then, if the discharge is thick then tell your trainer
Its normal when a horse is in work to have some discharge
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