They have a vegan menu available if you ask (and a gluten free menu on the reverse side).
Don't get the vegan pastas -- the portions are way way too small and the flavor was only about a 3-star.
If you are hungry, stick with the pizza and take the risk of getting somewhere between a 1-star and 4-star pie. Terroni's is very inconsistent.
Overall, I recommend skipping them completely.