Salma Hayak's dog was shot and killed by someone who is very, very cruel.
Hayak's 9-year-old dog Mozart died a week ago ... found dead at her Washington state ranch with a bullet close to his heart.
Salma didn't reveal the tragedy until Friday night, saying "He was the most loving and loyal companion. He didn't deserve a slow and painful death."
Salma was incredibly close to Mozart ... she delivered him out of his mother's womb.
So far the culprit has not been ID'd and law enforcement says they are investigating.