What specific nutritional element is essential in puppy formulas for proper development?

Answer

Specific calorie density and calcium-to-phosphorus ratio

Puppy formulas must contain the exact calorie density and the correct calcium-to-phosphorus ratio necessary to support the rapid development of bone and muscle during the first year of life.

What specific nutritional element is essential in puppy formulas for proper development?
foodanimalDognutritionScottish Terrier