Marcos pizza does not have any animal ingredients in their hand tossed crust, and you can get a pizza with no cheese or meats. They do also offer salads as well.
This is a question best asked the restaurant directly, not the community. Marco's is a specialty PIZZA shop, though, so they pride themselves on their meats and cheeses. I'm sure they could make you a vegan salad or a vegan sandwich, but that would leave out all the ingredients for which they are known...
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