This is a teacup!
The simple truth is that there is NO SUCH THING as a teacup Chihuahua. Chihuahua’s are the smallest breed of dogs, and there is no reason for them to be any smaller. The consequences of breeding “teacup” Chihuahuas is unethical and disgusting.
Unethical breeders will often starve a pregnant momma in order to stunt the growth of the puppies, often resulting in the death of the mother from malnutrition, or feed the puppies very small amounts of low quality food, or simply lie about the age of the puppy you are buying.
These horrible practices result in smaller dogs yes, but pets that are unhealthy and suffer from many aliments throughout their lives, such as collapsing trachea or enlarged hearts. If you have purchased a “teacup” or “miniature” Chihuahua please see your vet to discuss any possible nutritional needs your pup may need.
Here is a great link for more information Teacup Chihuahuas