My Dog is Vegetarian

Don't get me wrong, my dog loves to eat meat. But we rarely feed him meat. In lieu of meat, he gets plenty of vegetables. When preparing vegetables, he gets all the extra bits. He particularly likes to eat celery and apple cores. I think the only thing he doesn't like is citrus, but I'm always giving him new things to try to see his reaction. While my previous dog hated hot sauce, this one laps it up. He also likes popcorn, especially butter flavored.