There is no such thing as a "teacup chihuahua".
It's a marketing term used by profit-driven backyard breeders who want to charge excessive amounts of money. Responsible breeders do not use this term.
They are usually runts, or nutrient-deprived to stay small as a puppy that ends up getting big when fed normally.
Runts do have potential health issues and very small chihuahuas will be more likely to have problems such as hypoglycemia (low blood sugar), liver shunts, are generally fragile.
With a puppy that small you will want to make sure it has food available at all times. Going without food for even a short period of time in such a small dog, (especially a puppy since they can't store glycogen in the liver as efficiently), can cause the blood sugar to drop dangerously low and seizures, coma, and death can result. They will eat as needed, but if they run out of food while you aren't home it can be disastrous. I recommend a vacation feeder that holds several days worth of food.
It is possible to breed a healthy, smaller chihuahua through selective breeding, but most of the "teacup chihuahuas" you see advertised are not this. It makes many generations of consistent selective breeding smaller chihuahuas to achieve this.
I know someone who bought a pup advertised as a "teacup" chihuahua for almost $2,000 on the internet, advertised to be 3 pounds fully grown. When she got it, it was tiny and emaciated and quite obvious the breeder had been starving it to stunt its growth. When fed normally, it ended up being almost 8 pounds. It also had bad patellas.
If you are looking for a small chihuahua, be aware of the health risks and find a reputable breeder, and check the weights of the parents and grand-parents.
Back-yard breeders make all breeders look bad and ruin things for the ethical breeders. Do not support them. Do heavy research before buying a puppy to avoid potential heartbreak.
Animal Biology degreed chihuahua breeder
· 1 decade ago