They can eat large breed dog food, but it is not advisable to give Chihuahua's large breed dog. The reason for this is because the food particles in most large breed dog foods are generally to big for small breed dogs to fit in their mouths and chew.
Puppy or dog food only.
Either puppy wet food or Puppy dry food it doesn't matter but as long as it say puppy food.
If the puppy is only 1 month old you need to soak puppy food in water, get it soft,mash with a fork and let puppy go for it.
I feed my Chihuahua science diet small bites.
The puppy will get sick and throw it all up.Make sure you read the puppy food label and feed the right amount.When the puppy is done eating,if there is any food left over pick it up until the next feeding.
Puppy formula or puppy food
If the puppy is 4 weeks old or older soak some dry puppy food in water loosen up with a fork and he/she should eat it and about 2 week all teeth in they should eat the food dry good.
Orijen puppy
Chihuahua puppies should be fed high-quality puppy food formulated for small breeds. Choose a food with real meat as the first ingredient and avoid fillers like corn or by-products. It's also important to feed them small, frequent meals to prevent hypoglycemia due to their small size and high metabolism.
Puppy food. Quality puppy food.
It is fine to feed you puppy wet or dry puppy food known ad Kibble. Water can be added to kibble to make it into a porridge mix which younger puppies prefer or a mixture of both. more information at allthingspuppy.co.uk/post/best-puppy-food-2021
The best puppy food is one that has meat listed first, do not buy puppy food that has fillers like corn,wheat,soy or meat by-products.