Yesterday I received my eBay purchase.

Last week I missed Xena because I was semi-asleep on the floor and she peed right next to me.
If she had made some sort of noise I would have known about it.
I've seen on YouTube and even America's Funniest Home Videos people having success training dogs to ring a bell(s) to go outside. Most on YouTube, though, use jingle bells tied to a string hanging on the door knob. I don't like that because I don't want to hear the bells every time I open my apartment's front door.
After I got it yesterday, I sat down with her facing me doing the whole training and conditioning thing. "Bell," *ring* "good bell," etc... Lifting her paw to touch the top of it.
Today she once again has amazed me. After about a dozen more times, she actually started hitting it on her own. She used her mouth for most all of it. Mouth, foot.. I don't care. She can SIT on it for all she wants, as long as she rings that bell! Two different times she lifted her paw onto the bell (missing the button, though) in an attempt to get that treat.

It's not carved in her mind yet and it's no where near perfect, but I'm amazed at her rapid progress.
I always put the bell back back in it's SPOT over by the door after I'm done with the training session and I ring it every time we go outside together. When she can ring it consistently on command, I'll leave it there for good and ask her to ring it when she shows me she wants outside -- right now she just sits very quietly in the same spot.. looking at me.
She's such a good little girl.