First he is a baby. Second he was taken to young from his mother and the rescue should have know better.
Thrid ignore it. Pass him things he is allowed to chew and put him on the ground or away when he chews on you do not resond. The resonce to him is attention and he will do the behaviour more.
Do not roll him on the back as it will only instill fear and that is the base point of aggresion.
I would call the rescue and ask them to please if they can take him back with his siblings and his mon until he is eight weeks old. They need to help teach bite control.
JL
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"The truth about an animal is far more beautiful than all the myths woven about it." Konrad Loranz |