Threatening to kill the dog is just plain cruel.
Whatever happens shouldn’t be attributed to malice. I won’t hurt your pets. My superiors ought to award me for it. I was just being stupid.
This is not a valid activity. Either you have proof or you don’t.
A proper hardened criminal will never confess.
If you have a confession, it’s >70% chance for perversion of justice:
A terrorist will confess because they want fame
In Russia you pay someone to ‘confess’ for your crime and go to prison instead of you.
The naive, mentally infirm will confess, often to things they didn’t do.
Or you managed to torture a confession out of someone, like they did here.
Confessions lead straight to Spanish Inquisition type of justice
People do of course care about their pets, but John Wick used the death of a pet as its instigating event because it was different, not because it was a remotely usual way to respond to a pets death.