It looks like we may need to find Z some good undies if she wants to continue to have couch privileges (she has an incontinence issue - see Health), but I have no idea where to find good looking/working ones. Specifically, they need to be reusable, comfy for the dog, absorbent (i.e. not just for females in heat), and NO ruffles, bows, or pink! I did a quick search last night and only found ruffly crap or things that looked great but were almost $30 each!
I figured you all here might have some good ideas; I'm also considering contacting a cloth diaper (for kids) person about making ones with a tail hole and/or buying small undies and making my own with a maxi pad, though Z is so small waisted I think I may have trouble finding stuff small enough!