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Dry Food
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According to the ASPCA, you should always allow your nursing dog access to a high-quality, high-protein dry food. One formulated for puppies or for highly active dogs provides part of the fat and protein that your lactating dog requires. Many of these foods contain at least 30 percent protein and 20 percent fat.
Fat
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Nursing puts a lot of stress on a mother dog. A common symptom of stress is hair loss, especially if your dog isn't getting enough fat in her diet. To prevent this, try drizzling some organic olive oil over her food to prevent hair loss and help her maintain her body weight.
Working-Dog Supplements
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A number of supplements are formulated for use by canine athletes. These supplements contain extremely high levels of fat and protein and usable, fast-acting carbohydrates. The protein and fat provide enough calories and nutrients to help your lactating bitch maintain her body weight and glossy, full coat while the carbohydrates help keep her energy levels at a steady level. Ensure that any product you choose complements your dog's nutritional needs by providing vitamins and minerals, as well.
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Supplements for Nursing Dogs
A dog who is nursing pups has calorie needs roughly equivalent to a racing sled dog. Helping your dog maintain weight and health requires careful planning and preparation. In order to support her litter, she needs enough calories to maintain her weight and health, as well as produce milk and nutrients for her and her pups, and a constant source of fresh, clean water. According to Drs. Race Foster and Marty Smith of Wisconsin, your dog will require roughly four times the amount of calories she usually eats while nursing her litter.