One more consideration is supplements. Don't give them unless your veterinarian prescribes them for some special reason. All good-quality dog foods labeled as "complete" will provide all that your dog needs in the way of nutrition. There may be rare or special circumstances, such as pregnancy and lactation, when your dog requires some supplementation of one or more nutrients, if recommended by your veterinarian. But casual supplementation can cause serious imbalances and unexpected problems. More of a good thing is not necessarily better.
Basically, the food you serve your Jack Russell Terrier should contain protein, fat, carbohydrates, fiber, vitamins, and minerals, all in proper quantities and in proper proportions. It is highly unlikely that a high-quality food will be lacking in any nutrient your dog needs for healthy growth, development, and maintenance.
It is impossible to give general advice and be right all the time. You know your Jack Russell Terrier better than anyone else. As a responsible pet owner, you should seek the advice of your veterinarian and the dog's breeder, read labels, and then decide what food is best. The appearance of your dog is the best indicator of good nutrition; watch her as she develops, grows, and ages, and adjust her diet accordingly.
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