Finally, while watching the dogs wander and stare mournfully at me in the tub, I figured out what their problem is.
They're not fascinated. They're worried.
It's so obvious to me now that the dogs are terrified that I'll slip under the water and drown and thus be unable to feed them and pet them and tug on their ears.
I realized this when FarmDog would go from staring mournfully at me to diligently investigating every corner of the bathroom, obviously looking for something edible in case of my demise.
Also, it says something about me (probably something very sad) that I got the most amusement I've gotten in a long while out of watching her when she got a little fluttery bit of toilet paper stuck to her inquisitive nose.
It stuck to her wet nose, she sneezed, it stayed stuck, she shook her head, it stayed stuck, she crossed her eyes at it (I am not kidding) it stayed stuck.
Finally she resorted to snapping at it. Yes. Picture it. It's stuck to her nose and she's snapping at it. Lunging forward trying to catch it unawares.
I almost did slip under the water and drown laughing, watching this. Fortunately Fuzzy Pup wandered in at this point and she wiped it on him like a true sibling does with anything that comes from one's nose.
Then she looked at me like I was a horrible person because I was still chortling and snorting and holding my sides and went to lay just outside the bathroom door, while Fuzzy Pup took up the vigil to make sure that I didn't do something stupid and kill myself in the tub and cut off their supply of treats.