Aw, awesome :-) I remember now reading some of your other posts about Thor - I'm sure you'll be able to get him trained, but it'll take a bit.
Here's another example of how smart these dudes are - In two days, Nikko has already figured out his new bell, AND his new treats. On the second day, he rang the bell to be let out to pee, and then proceeded to do three short little pees outside instead of his normal one big pee so he could get three treats! The peanut butter chips are now being split into fourths, lol. But there've been no accidents in the last couple days either! I just hope this keeps up - for Thor and for Nikko. Gotta love those "ah-ha!" moments. :-)
If you keep up with the bell or really any encouraging him to pee outside at all, I would definitely designate one door to be a potty door, and one door an everything-else door if you possibly can, even though they lead to the same hall. Just my 2 cents, from my experience.
