You're welcome, Vickie.
Another thought: if you aren't already doing this, powder the bottoms of his feet with an athlete's foot powder - like Gold Bond or the generic versions. That will help absorb moisture when in boots a lot, plus it will help control any greeblies that may try to set up housekeeping in that dark, moist environment. Some people have used Diatomaceous Earth the same way.
Jan 2005, RI