I'm going to put my ex's dog down and not tell him about it
That doesn't sound like a good thing to do? Why would you want to hurt your ex's pet?
He's a total asshole and is going to lose his dog just by being a bad owner.
I get that you want to have no contact with your ex, but you should at least tell him about his dog. It could seriously hurt him to find out about his dog from someone else.
Nah. I'm going through with it.
This isn't right and you know it, how would you feel if someone put down your pet? Hurting an innocent animal because you dislike their owner makes you seem like a terrible person, and I don't think you want to give off that impression.