How long should a chihuahua puppies eat and sleep?

My dog sleep like most of the day including night, is that normal? Also i follow the guideline on the dog food to feed at least 1/2 to 1 cup but he always to eat more, should i give him more?

My 3 month old Chihuahua puppies breathe smells like tuna…what can I do to get rid of the smell?

*INFO:
I just got her a week ago and her breathe smelt then, I have only been feeding her Pedigree *Small Breed dog food...Is there something I can buy that will get rid of the tuna breathe, or some other type of food to feed her.....PLEASE HELP, THANK YOU SO MUCH!

Do chihuahua’s need any special dietary considerations?

I'm adopting my first chihuahua and have been doing some research. I found out that they can be prone to knee, eye, and heart problems. I currently feed my other dog Evo dog food, will the small bites version meet her nutritional needs too? She is a young adult and is coming from a rescue that doesn't offer any advice on her specific breed. She's so small I'm tempted to feed her soft food too, but I would never do that to my larger dog due to the higher fat content and less nutrients that are in most canned foods. Any advice?

What is the best food to feed my toy Chihuahua?

I just received a toy Chihuahua (2yrs old) as a gift and we purchased Iams toy/small breed dog food, and she has barely touched it. What should I do?