I can remember some folks recommending the "bad girl panties" from Camp Greyhound. Link: http://www.freewebs.com/awesomepaws/whatsnew.htm (scroll to the bottom) It looks like they make them custom to your girl's measurements.
Lauren, I have been following this, and am so sorry that this happened to you.
I'm glad to hear that Bernie is on the mend. It's great that your mom is there to lend a hand. Best wishes to you all!