@Buttonstc – Not IRL, but I was a member of another forum where there was another member who was adamantly vegetarian (and actually a raw food person, too) who repeatedly tried to convince others to convert their cats to a raw food vegetarian diet. She was also against vaccinations of any kind for animals or people. Unfortunately, she seemed to catch a few innocent souls in her nets. I can only hope their vets set them straight soon enough to prevent harm to their pets.
Somewhere on my shelves I have a book about converting one’s cat to a vegetarian diet, complete with recipes. I bought it because I simply couldn’t believe the author was serious. I discovered that the author had much in common with the folks who wear tinfoil hats, just without the tinfoil.
In any case, I feed my cats and dogs expensive prepared food that does not contain corn or beef, but is indeed animal protein-based, and they all seem to do well. Most live well into their teens with few if any chronic problems. One cat made it to age 21, and our oldest dog is 16.