@Duke:
I will certainly pursue finding out if Duke is full or mixed. For health reasons -
I finally found out - Duke is determined to be Basenji mix. I contacted a gal from the Basenji Club here in Michigan. Her professional opinion was that he also has terrier. What kind of terrier - possibly Toy Fox - I need to scope out the terriers at a couple dog shows. In all though, Duke's weight and height is typical of full grown male basenji. However his fur is thicker and longer than Basenji. Also, she didn't see any facial wrinkles - and he barks. I think his muzzle is a bit longer than the Basenji's I saw at Pet Expo.
I am satisfied knowing that he is a mix. Because he was abandoned, I was worried about health problems down the road if he was irresponsibly bred by the irresponsible people that cut their tails off and dumped him and his brother.
I have to say though, he looks alot like Basenji. He has all the quirks that I totally enjoy. I look forward to getting a Basenji - when the time is right for us. I bet Duke would love to have a sister!