Sounds just like my Sarge. He is super sweet, lovable but he has his wild animal side. We know when he switches into this mode and we are on guard....it is just his play time. He will grab our hands and arms with his mouth but never bite with a hard force. It is like he knows a play bite and a real one. The older "Taz" gets the better he will be with it. Just reinforce with a "NO" when he bites to hard, he will learn. One thing that is true about Basenjis, they all have different personalities...so what works with one may not work with another so you have to modify and experiment until you find what works with your Taz.