Yes, most commercial brands of
Caesar Salad dressings contain
Anchovy Paste. Most, if not all Ceasar Salad require
Worcestershire Sauce, and the most
famous brand, or at least the most well known around here
Lea and Perrins does indeed contain
Anchovy Paste. For some reason though, the
SafeWay brand of
Worcestershire Sauce does not contain
Anchovy Paste. So, you can have a rather decent
vegetarian Caesar Salad without a great deal of hassle.
Kraft Dressing (Which does contain
Anchovies) seems to be most common, and therefore most likely to be found in resturants. It's probably a safe bet that most resturant caesar salads aren't vegetarian, it never hurts to ask though. As well,
IIRC the 'Traditional' or first
Caesar Salad recipe didn't call for
Anchovies (According to the Yves Veggie cookbook I was reading at the time).