Costco® Kirkland Signature Pizza (Cheese and Veg.) is HALAL

My family and I are Costco® Wholesale shoppers and on our monthly trips we always sat down to a delicious giant pizza served by Costco®'s food court. And then we came to know of animal rennet - an enzyme used in cheese manufacturing! Not all cheeses are Haram because some companies; to cater to vegetarians, are switching to microbial enzymes which are Halal because they are from natural bacteria. So you always have to investigate about your pizza before you dig in.
We had stopped eating the Costco® pizza because of the doubts about Kirkland's cheeses.
However, I emailed the Costco® Wholesale Corporation's Member Services; they allow their registered members only to email queries and I emailed the question as follows:

"I would like to inquire about the cheese used in Kirkland's Cheese Pizza served at the restaurant cafe at Costco. Does the cheese contain animal-derived enzymes? Also, does the crust contain any animal products? Is it a pure vegetarian option for me?" 

The Member Services Team was very efficient and I received an email the very next day from a rep. called Brittany:

"Dear Ali,

We appreciate you taking the time to email Costco Wholesale. Our Pizza Dough contains: Flour, Water, Olive Oil, Sugar, Salt , and Yeast. The cheese on the pizzas is not Kosher certified. However, it is not processed using animal rennet. 

Thank you,
Brittany
Costco Wholesale Corporation"

NOTE: Please remember to carry your own pizza slicer with you to avoid contamination by meats transferred by the pizza slicer as they use the same for all pizzas.

ALLAH KNOWS BEST.