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
Control Unleashed
Fiesty Fido
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!
http://www.dogdaysnw.com/index.html
(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.
http://www.betterbehaveddog.com/A_better_Behaved_Dog/Home.html
http://www.dancinwoofs.com/Classes/Description_classes.asp
http://www.kindredheartsdogtraining.com/kindredheartsdogtraining.com/Training_Classes.html
(couldn't get a really good feel for training methods on this one, but maybe worth looking at)