I am having difficulty finding a good vegetarian dog food. It has been Vet recommended.?

Natural Balance Vegetarian Formula or AvoDerm Natural Vegetarian . I personally favor AvoDerm but Natural Balance is a great product as well. RoyalCanin is another good company to research. All three are low purine diets. Occasionally you can give your lab low-fat cottage cheese, it is a great treat/snack for them and great for the skin/coat. Dogs on a low purine diet can not have red meats, poultry, brewers yeast. etc etc etc the list goes on and on!