Nah, I don´t care about my animals seeing me nakes...what for? It´s not like they show any kind of different behaviour, comment it or turn around and tell my junk size to their friends...
Animals very well know the difference between naked and clothed...for them, it´s like you dropped your fur coat. You are still the same person.
Contrary to what most people believe, an animal is NOT always able to recognize you if you dress up...for example, one time I put on nothing but an NBC mask and my dogs barked at me until I took it off...they can recognize your face even over your smell.
The other time, I wore the rubber hood as well, same deal, until I took the mask off.
Only after a couple of times my dogs now even recognize me in NBC gear, which means they REMEMBER the different ways you look...not just scent.
The point I´m getting it is that animals aren´t as stupid or uncaring as people might think, they know you, and especially your face...any kind of strange behaviour they will recognize.
But they won´t care if you are naked or not.
PS: They also might notice you getting sick even before you do.