I Need Advice for My Soon to Be Vegan Cat?

A person asks a question on AdviceBox:

I need your expert advice vegan protein to help Mr. Abersnackle with his new diet. I love this cat, almost as much as my dog. It is an old and dear friend and I have confidence in your decision vegan. I want to make sure that Mr. Abersnackle is not a deadly killer. It is a very sweet cat. All the kids on the block love him because he is great and friendly. They hug a lot. It could be an example of how we can all become vegan.