It looks like this is true, but I couldn’t find a super reliable source on it. Thus, I will declare the information “sorta iffy”, which is a definitely technical term. Sites either declared it true or said said it wasn’t solely because of the fact that he had a pet mouse.  The majority of the “sources” err on the size of it being true, though, and, as the pet mouse and fear of mice isn’t necessarily mutually exclusive, I went ahead and posted this.  Call BS if you know better!