Welcome and congrats on your new addition! I'm no expert, but I would re-think neutering early. I would wait until the growth plates fully close and then neuter him. And I would not say that the breed is susceptible to attacking, though Basenjis can be reserved and cautious with strangers. Most are confident, loving dogs, when socialized. It's always good to keep an eye out for problems, however, and address any aggressive behaviors before they have a chance to escalate. Good luck with him!