I was worried about the dog too
I never heard anything more about the dog. All I know is that this guy went to his ex-wife's apartment next door to where I buy groceries sometimes, had some sort of confrontation, shot his early-20s stepson 8 times at point blank range in front of mother and younger child, and took off with the child and the dog. Then a couple of hours later he dropped off the child at a house in Indiana and the child was taken safely to police, and the guy is still on the run.
I hope that the dog was dropped off too and they just neglected to report it.
Apparently the young man who was killed was a friend of my parents' neighbors. I never met him, though.