Crate training is the only way I'll go with housebreaking. It worked wonders with both dogs I've done it with. The dog goes into the crate at night, and, any time it can't be supervised. Depending on the age of the dog, you'll need to take it out at night, every two hours. Make the biggest deal when they go potty outside, even treat them if you want. Try to avoid making a fuss when they potty inside. Negative attention is still attention. If you don't catch them in the act, definitely don't discipline. But, if you see him going potty inside, a firm no, then take him immediately outside. During the day, take him out all of the flippin' time! Especially after play and eating. And, when you're outside, and, he doesn't seem to want to go, sometimes running around a bit will get things going for the puppy. Good luck!

And, I think it sounds like Thor is in his perfect, forever home!