It’s bath day for the guinea pigs. Ruthie and I pluck Luke and Chewbacca out of their playpen, where they are happily gnawing on their celery dinner, and plop them into the small cake pan that I call their bathtub. In the four months that we have been guinea pig owners, we have only bathed them once before today. The internet says that’s fine. The internet also says that it’s our most important responsibility to make sure that they don’t get too cold in the bathing process, because that could lead to them catching a respiratory infection, and respiratory infections can be deadly. Ruthie remembers the rules. “We gotta, we gotta make sure they stay warm! Or they could DIE! I’ll get some blanklets,…