[joeysteele]

Just ring Pizza hut and ask what type of mozarella they use on their pizza's,you have a right to know and if they say the low moisture one you know that it's milk from cows involved.

There's nothing wrong in asking them, you may have been someone with some allergy to buffalo milk, people do have with goat's milk so it's well in order to ask them directly.
You could even just ask that it is low moisture cow's milk they use in their pizza's isn't it, then get their response. Your worries are then over.