Hopefully the parents of your puppy were DNA tested for Fanconi. It is a serious condition. You can read about it at www.basenji.org or www.basenjihealth.org along with other basenji health concerns and the important of health testing and having those health tests for public viewing (as seen on www.offa.org)
If this puppy's sire and dam were not tested, I would highly suggest that you do the DNA test on this boy. It is a cheek swab test that you order the kit yourself and well worth the cost of 65.00 for peace of mind.