Why is even a small cough a big problem in a racehorse?
Phys.org -

Coughing is really common in horses, but it's not normal. That's true for all horses, but racehorses demand a different level of respiratory excellence than other horses. If you look at the way racehorses use oxygen and the demands they put on their body, they are living on a cliff edge—it's phenomenal that they can even survive a race.

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