Well, he sounds just like me. But it was probably more socially acceptable because I was a girl. In retrospect, I would probably call it grieving and would treat it as such.
DS certainly had some tendencies that way, especially when an insect was killed. It would take a long time to calm him down. What helped, in that case, were small rituals, ways to memorialized what was lost and acknowledge the grief. We had little signs up all over the house to mark the death spots of moths and beetles: "In Memorium: Alex The Beetle 2002 RIP." It helped.
