I body clip mine in the winter so he dries faster after he gets sweaty from being worked. Mine gets very hairy and it can take an hour or longer for him to dry. My friend clips one of hers for the same reason.
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Sorry to hijack your thread, OP, haha. But I think as long as the horse seems comfortable with being wet when it's in the 60s or you use a cooler or something to keep him comfortable, he will be fine. With my horse I just keep an eye on him to make sure he's not showing any signs of being chilly.