So, I agree with vitamin C.
First it's one of the few ingredients that is in a non-chemically preserved food (BHA/BHT is chemical and has been known to cause cancer in animals)
http://www.beowulfs.com/magazine/label.htm
WHAT ARE PRESERVATIVES?
        "The average dog consumes 26 pounds of preservatives each year!" (Anderson, John "The Poisons in Pet Food", Alternative Medicine, May 1998)   Have you ever wondered how the bag of dog food you buy at the store is marked to last as long as the next two inspections on your car?   This is due to the miracle of preservatives.   They have been closely linked with a laundry list of problems ranging from cancer to severe birth defects in litters.  The main preservatives used in dog food are BHA, BHT, and Ethoxyquin.   BHA and BHT have been shown to cause liver and kidney failure and in high doses have been implicated as carcinogens.   Ethoxyquin in one form is used to prevent the break down of rubber, another form is used as an insecticide for apples, and the "food grade" form is used to preserve dog food.   It is banned in Europe, blamed for skin, reproductive, and nerve problems.   You may wonder why, given all the dangers to our animals, manufacturers would use chemical preservatives?   That's easy; they give pet foods the shelf life of approximately two years and are much cheaper than natural preservatives such as Vitamin E, Vitamin C, and Rosemary.   The most widely used argument for the use of BHA and BHT are that they are found in human foods as well. (Humans had the sense to avoid Ethoxyquin)   This point is invalid with animals, however, because animals eat the same diet twice a day for years.   Humans vary their diets, reducing how much they consume and are therefore at a lower a risk.   Be aware that some manufacturers will say they use Vitamins to preserve their food, but that food still has an extended shelf life.   The chemical preservatives are not added by the manufacturer, but rather the ingredients are pre-treated with the chemicals.   If the manufacturer did not specifically add the "ingredient", they do not have to list it.   This is another loophole for manufacturers and just as unhealthy for your animal.   Make sure to check yourself.   A truly natural food will have a shelf life of one year or less.
This is a sample of one of many articles written on the side effects of BHA/BHT

Dogs naturally produce their own vitamin C, but, they may not be getting enough: http://ighawaii.com/naturally/newsletter/lpvc.html
I never seen any negative effects of vitamin C. So, I see nothing wrong with supplementing it a little in their food, especially being so far down on the list of ingredients, it's not a huge amount.

I also believe NO DOG should be eating in a bowl where their head is much lower than even with ther shoulders... This creates stress on the back and neck. Do you eat bent over with your head down??