There are plenty of vegetarian ketogenic diets. A ketogenic diet is one that contains very few, or no carbohydrates to maintain the ketosis - just high in fats

There are plenty of vegetarian ketogenic diets. A ketogenic diet is one that contains very few, or no carbohydrates to maintain the ketosis - just high in fats and medium in proteins. Meat is a convenient form of food with those properties, so often people maintaining such a diet eat a lot of meat.