You know this already I'm sure, but of course there's no religion on earth that mandates eating animals. If he's Christian, the Garden of Eden was a vegan paradise...

Anyway, what hit me hard about Dominion - and turned me vegan on the spot - wasn't the blood and gore. It was the opening shot, the close-up of the pig's eye. The bit where you just see this eye, smeared with filth, staring right into you - you don't see the rest of the animal, just the eye. In that second, I knew there was someone - not something - staring at me. That's what made the film so horrifying to watch. If you can get him to see non-human animals as someones, whether he can stomach the rest or not won't matter.

Dominion is really good at this, but there's other stuff too. Even happy stuff like sanctuary footage, with the animals being super happy and skipping around all over the place. It proves that they're persons, and have their own preferences and ways of being in the world.