There are now vegan foods being manufactured for cats. They are supplemented with taurine and other necessary nutrients needed by cats. Obviously, if a vegan really wants his cat to be vegan, the animal would have to be kept indoors...always. This is totally against the animal's instincts. They claim to care about animals, but yes, they are cruel.
Given the nature of the question I hesitate to say this, but it’s nuts! You can bet your boots that once outside any cat will hook itself a tasty morsel in the shape of a mouse or an unsuspecting bird.
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