Read the text, and answer the questions about it.

Without Extra Nutrition Now, Your Puppy
Could Face A Though Climb Ahead.

Since your puppy only has a year or two to grow from a newborn into an adult, every day is crucial. In fact, growing puppies need nearly twice the nutrition of adult dogs.

That's why Purina® Puppy Chow® brand puppy food has extra protein, iron and calories. Because without extra nutrition now, your puppy could face a though climb ahead.

Tomorrow's Dog Needs
Puppy Chow Today.

Questions:
a) How long does it take for a dog to become an adult?
b) Who needs twice as much more nutrition?
c) Name three extra ingredients that the puppy food contains.