There are many movies that are great for promoting compassion toward animals. They are movies that not only every vegetarian and vegan should know about and watch, but that everyone should watch. Some of these movies can be watched for free online.
Here is my list of what I think are some of the best movies that promote having compassion for animals, as well as vegetarianism and veganism:
I'm sure there are many others and as I see them I will add them to the list. But I have seen all these and can recommend as well worth watching. They are listed in no particular order.