Lactic Acid Fermentation
Vegetables are important to canine health, and although advocates of home-prepared diets debate the quantity of vegetable matter dogs should consume, all agree that vegetables contain essential nutrients that are not provided by other foods. Cats do not require vegetables for optimum health, as Dr. Pottenger proved, but many breeders report good results from adding small amounts of raw vegetables to their food.
One way to help dogs and cats digest vegetables is to puree them. Blenders and food processors make this task easy, and pureed root vegetables like carrots and parsnips, leafy herbs such as parsley, and grasses like wheat grass or barley grass can be added to every meal with good results.
Another way to improve the digestibility of vegetables is with 
lactic-acid fermentation, and a growing body of research indicates that this method both prevents and helps cure cancer and other serious illnesses. According to William J. Fischer in 
How to Fight Cancer and Win,15 lactic acid fermentation produces vitamin C, B vitamins, enzymes that support metabolic activity, choline which balances and nourishes the blood, and acetylcholine which tones the nerves, calms the mind and improves sleep patterns. Lactic acid is also a chemical repressor that fights cancer cells without harming healthy cells. Lactic-acid fermentation imitates the digestion of plant foods in the stomachs of small animals that dogs and cats in the wild would eat.
As with any new food, introduce fermented vegetables gently and in small quantities. For dogs and cats that are slow to accept new foods, this can be as little as a fraction of a teaspoon mixed with the animal's regular food, increasing the amount a little each day. Whatever vegetables a canine or feline menu plan recommends can be replaced with a slightly smaller quantity, such as 10 to 15 percent less by volume, of lacto-fermented fare. Fermentation and pressing condense the vegetables and concentrate their nutrients. The resulting liquid, which looks like water but is really the vegetables' juice, is a rich source of lactic acid and other nutrients. It can be added in small amounts, such as 1 or 2 tablespoons at a time, to a pet's food and drinking water.
For more detailed instructions, see 
The Cultured Cabbage: Rediscovering the Art of Making Sauerkraut by Klaus Kaufmann and Annelies Schoeneck21 or 
Nourishing Traditions by Sally Fallon.23 Lacto-fermented vegetables are sold in some health food stores.22
 
 
 
I can post more if more is needed. Many books and articles done by health professionals all over the world. This is strictly about dogs and cats and vegetables.
 
http://sagepetfoods.com/2012/02/benefits-of-fermentation/