This article is from the Chihuahua Breed FAQ, by firstname.lastname@example.org (Melinda 'Bob' Casino) with numerous contributions by others.
No. They have the same nutritional needs as most dogs. I feed mine
regular Alpo kibbles, and, although the kibbles are large, my
Chihuahua seems to sort of enjoy cracking each one with her jaws.
Chihuahuas prefer several small meals per day, rather than one big
meal. I leave a bowl of kibbles out for my Chi and she seems to eat
about three small meals a day.