That being said, I would not buy pets in the near future. You need to have your son evaluated.
Not necessarily. This behavior could be mere experimentation given his age. I think that it is very healthy that he shows remorse for his behavior. I would be very concerned if he was indifferent to this behavior and showed no remorse. I wouldn't be so concerned about this behavior. However, it is always a good idea to check out the behavior with a therapist.