Adorable face - probably a devil in hiding :p
If the biting is clearly play biting a firm NO should work (and see previous comments). If more serious then try bitter apple spray. You definitely want to stop this type before it gets out of hand.
Mine (3 yrs old) occasionally will bite (gently and really just a mouthing) when trying to get my attention to play. But you can tell from her expression that she knows she did something unacceptable.
Consistent training is the most important thing you could do.
You can do the DNA test for about $60-70 with a cheek swab to know for sure. He is really, really cute and certainly could be part basenji. Welcome to the group.
