People not liking it when you kill dogs is subtly hinted at in John Wick (2014) when they

SPOILER!

kill his dog.

and at least one woman kills her dog herself

John Wick approves of this message.

Fun fact: Killing dogs is seen negatively in Japanese culture, as it goes against the concept of 生きる, or “to live.”

This is something you’d hear Crypto and Pox say in Destroy All Humans lol

“They eat with their mouths‽”