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Similar to healthy dogs, sick dogs need to eat in order to supply energy and nutrients for growth, for replacement and repair; as well as to meet an ever changing need. Nutritional requirements for a sick dog usually do not differ greatly from those of a healthy dog. A sick dog’s dietary needs, however, can become substantially different from those of a healthy dog.

Diseases in which a dog’s diet will need to be changed are often due to true nutritional diseases, in which the diet itself is responsible for the disease. Most of the true nutritional diseases are deficiency diseases. What this means is that they are diseases caused by a diet that contains an insufficient amount of one or more needed nutrients. Most of these diseases were the result of inadequate or improperly balanced home-made food. Since cost-effective commercial food became more and more nourishing, most of these deficiency diseases gradually disappeared. Vitamin or mineral deficiencies are rarely seen as a primary disease any more. Both vitamins and minerals are inexpensive and are needed in such small amounts that today, few commercial dog foods fail to contain them in adequate amounts.

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