This is terrible. I feel awful for the animals, and awful for the child. I just took the "Mandated Reporter" course last night, and I can say that child was definitely venting something out that he did not feel able to express in other ways. I suspect *serious* troubles at home.
I hope he gets the help he needs, and if necessary, some "away time" from his caregivers.
My heart breaks at the thought of those poor animals.