John Wick almost had an alternate ending where the puppy lived, but Keanu Reeves "stood up" for the original vision

Keanu Reeves as John Wick.

If there's one thing everyone knows about John Wick, it's that he was really upset when the bad guys killed his dog. 

As it turns out, that almost didn't happen. An alternate ending of the film could've showed the innocent pup survived, but Keanu Reeves himself was opposed to the idea.