If he's lacking a tail, he could be a rat terrier more than a basenji.
Otherwise, no matter the breed, there are several things you can do. He hasn't really been in your home very long so it's a great time to start implementing house rules. I'd suggest a thyroid test (just to be sure things are in working order) AND I'd try a DAP. Also see if you can find a behaviorist or a good positive training class. If you were local to me, I'd suggest a friend's Realtionship Building class. Call around many more progressive training facilities are offering this type of class.
Books that I would suggest would include:
Click to Calm
I also just finished reading Reaching the Animal Mind - great book, wonderful intro into clicker training if you haven't done it before.
I have no idea exactly where Madras, Or is, but this place looks great!
(one of the instructors was on the Control Unleashed list before it closed. very helpful, insightful person)
Just using google, I found several promising looking training centers near Madras Or. Of course you'll want to call and i'd ask to watch a class or two to see if you feel comfortable with your potential trainer.
Here's what I found that I'd look into if I were in your position.
(couldn't get a really good feel for training methods on this one, but maybe worth looking at)