Cold and rain don't cause disease, no. But they can tire your body out more, and your body spends so much energy struggling to stay warm and conserve body heat that it doesn't have enough left to fight off any potential virus or bacteria. And if someone were under a lot of stress (as someone who has just run off from her parents, is lost in the mountains, and just had a run-in with a mountain lion might be), that would also detract from one's ability to fight off potential infection. So, there is a correlation. Just not causation.
In the book, Ken spends a night outside with Flicka, sitting in a stream, and when they find him, he's suffering from chills and hypothermia, which turn into pneumonia as the days pass. That passage of time is condensed in the movie.
Also, as others have pointed out here, this isn't the only movie where a character spends a night in the cold or rain and has pneumonia the next day.
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