That is horrible - so cruel. What on earth drives people to do that sort of thing?
There was a rash of poisonings in the Denver area when I lived there; someone was soaking pieces of meat in antifreeze and throwing it into random yards if a dog was seen. They never caught whoever did it; & the poisonings just stopped after a while. Quite a few dogs died...
If I was goD I'd have made that person drink a cup of antifreeze....