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The major nutrient required by a dog is protein because it helps in the development of the muscles, skin, nails and coat of dog. The required level of protein should be based on the age and activity level of dog. In some conditions your dog may need high level of protein such as if your dog is sick, pregnant and lactating. The suitable level of protein for a dog is about 25% to 35%. On average; a dog needs about 18% protein in its daily food intake.