Does pizza normally get made with Butter?
For example, if someone is allergic... or has an intolerance, to butter do they need to avoid pizza?
What about individual pizza companies like Pizza hut, Domino's, Jets Pizza and so forth?
Very, very few pizzas are made with butter. There is no way to make a universal statement, but butter is a rare. Olive oil would be more likely.
Many pizza doughs are fat-free, including the traditional pizza di napoli; New York style generally contains olive oil.
It is rare for any traditional toppings to contain butter. Some individual cooks might saute vegetables in butter, but even then, olive oil more common.
As for particular restaurant chains, you would need to check their nutrition information sites.
Note: as Derobert points out, some deep dish Chicago style pizzas may contain butter in the crust.
As @saj12saj says, very few pizza recipes use butter. As for chain restaurants most publish their ingredients, so you can probably find that information on their websites. I'd be surprised though, most chains prefer to use butter substitutes to lower their costs.