Doubt that he is a purebred. Hope the links to his other photos help you figure him out. I had a nice long chat with a woman at the shelter who thought he likely escaped his adoptive home and that the owners might not want him back. So far none of his adoptive homes were Basenji experienced.
The tail. Have to agree. Still, could have a nice Basenji attitude. 👊😁
Please go to Basenjirescue.org and join as a member. It will show you are serious about helping. BRAT always needs good foster homes. A home visit will be required (not sure if that is possible at this time considering this COVID-19 crisis). It is especially helpful if you have basenji experience. Not always, but very often, a basenji coming into rescue has special needs (i.e., behavioral, medical, etc.). It is good to ask yourself if you and your family are willing to deal with that. Fostering is hard but it can also be a wonderful and rewarding thing to do.