If I had seen this for real, I would have pummled him mercilessly

[AnefIsEnuf]

Looked like an accident, to me. Careless and irresponsible, yes, but the guy instantly seemed to be in distress when he realized what had happened. You see him trying to stop the elevator, so it isn't like he did it on purpose.
I'm glad the dog was okay. I was a little bit scared to watch, honestly.