best food for chihuahua pup

Question
Hello

Would Nutro natural choice be a good brand to switch the puppy over too once I get it?

Answer
Nutro is very well thought of.  There is very little scientific evidence that it or the other expensive brands are much better that others for the dog.  Still buying enough for a Chi isn't going to break your budget.  I would skip the the small breed puppy chow. It is easy enough to over feed such a small dog without feeding such a nutrient rich food.  More dogs suffer from too much food than low quality food.  Most puppies come from the breeder too fat.  They should have a waist.  Do not increase the amount the breeder was feeding until it develops one.  Do not cut back either.  A lean Chihuahua, will be a lively companion for many years.  Small dogs long lives are great.  

Your dog definitely should be narrower at the waist than the hips and chest.
You should be able to easily feel the ribs, but not see them.  Each dog is
different.  Standard recommendations are a good place to start, but each dog
must have its food adjusted to its individual needs. See
http://www.purina.com/dogs/nutrition.asp?article=292

The dry dog foods are actually better for the dogs.  It helps keep the teeth
clean, and exercises the jaws and teeth.  If you feed a complete dog chow, you
shouldn't need to give the dog anything else.  Various people foods may only
add more calories without providing proper nourishment.  Look at how many of
us are too fat too.  If you don't want to pay name brand prices look for
certification of passing the AAFCO tests.    Make any changes in diet slowly
over about a week.

The premium, concentrated foods give you the assurance of a brand name.  They
produce a smaller, firmer stool that is easier to clean up.  It is easier to
maintain weight on a finicky eater.  The lower cost foods may actually have
lower fat and be better for your dog.  Many dogs would enjoy eating the larger
portions you have to feed .