Most commercial foods (dry kibble and canned foods) contain some kind of meat or meat products in them (which aren't always good, like by-product meal and whatnot). Vegetarian foods are often just for animals who need to be on a special diet either to lose weight or to treat illnesses.
Then there is the raw food diet - feeding chicken, beef, pork (all usually raw except the pork), fruits and vegetables that are safe for dogs to eat (no onions, garlic, grapes, raisins, apple cores or pear cores, etc) - often these foods are used to supplement the commercial food. I'm not sure about what raw foods cats can eat but I imagine it's much the same.
Do you just feed a vegetarian or even a vegan diet to your pet because it aligns with what you believe in? Or do you not care and you feed meat to them?
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I've been a vegetarian since the age of 12 (I'm 25 now)
I feed my cats meat. They are carnivorous animals. It's their choice to eat what they like, as it's mine.
I wouldn't force my beliefs on a person or animal. Dietary, religious, whatever.
A cat is not civilised in the sense that humans are, and therefore they haven't created meat substitutes. They eat the protein because it's what their bodies need.
It would be wrong to stop any domestic animal eating what their wild counterparts would - nature is nature.