menu focuses on rotisserie chicken, but other dishes are available.
The allergy information guide seems comprehensive (it includes nuts, dairy, eggs, fish, shellfish, soy, wheat & glutens, sesame, and sulphites) but you may want to make further inquires when you arrive. I ordered take out once, and, when I mentioned gluten, the staff member instructed the kitchen staff to change gloves.
Swiss Chalet recently added wheat to the rice. I posted about that some time ago.