Vegetables supply dogs with most of his vitamin requirements, as well as essential fatty acids, and are also necessary for the fibre it supplies. But vegetables have a cellulose skin covering which prevents the dog from digesting it properly. In the wild, the dog will obtain his vegetable matter from the stomach contents of its prey - all suitable crushed and processed. If you give a dog a carrot, then you will recognise it as it comes out the other end and your dog will not have gained any of its nutrients. In order for the dog to digest and receive the nutrients from vegetables, they must be suitably crushed first. The best way to do this is to process the vegetables through a juicer or meat mincer. A food processor can also be used, providing it is run for long enough to crush the vegetables.