guinea pig travels

I just found out that my brothers girlfriend, who is a third grade teacher, commutes to work every day with a guinea pig. How f-ing cool is that? Apparently, she bought it as a class pet for her students, but she doesn't or can't leave it there overnight. So every day when she is done with work she packs the little guy up and heads home. Then the next morning she makes it some coffee, straps it in to its car seat, and heads to work. I want one. Now. I wonder if she gets to use the car pool lane?