Yes! Someone who has litterbox trained a Yorkie. You might be my new favorite person.
I'll go ahead and now and admit that I'm a born and bred cat person. Always had cats growing up and gave up custody of my last cat two years ago when my brother/roommate got married and wanted Buddy. I didn't know where I would live so I let him go with explicit visitation rights which I enjoy all the time.
My point is this, dogs are a new thing for me. Cats are so self-sufficient that you show them the litterbox once and they think "Hell, that'll work for me.". Easy to please and smart as all get out. Dogs are more infantile in their nature and require more parenting throughout their lives. For me, litterbox training is a HIGHLY
HIGHLY desirable method. It absolutely tortures me to put Bimmer in that God-forsaken cage when he could just eventually have free-roam of the house and go potty on his own terms.
I want to do the litterbox method. Plain and simple. I'm reading the entire forum now after a search on litterbox training, but please offer any ideas and methods you might find useful. I think we're leaning towards giving Bimmer the half bath in our house and setting up like you did. Do you have more specifics on the size of his penned in area and the size of his carrier? Anything else you can think of would be greatly appreciated. This method seems much more humane to me, but I'm about the biggest softie when it comes to animals.