I can't find any information on allergens on the Boston Pizza website, but a phone call to the Pembroke location we'll be visiting is reassuring. The manager is well-versed in the company's allergy policy; she tells me to ask for an allergy information binder which details the most common allergens in each menu-item. She also tells me in detail about the kitchen procedures in place to avoid cross contamination. Given the limited number of restaurants in Pembroke, this is definitely one chain worth considering.
Remember to always do your own research when eating out.