The so-called "teacup" chihuahua is a throwback. Sometimes a standard bitch will throw an excessively tiny puppy that remains small throughout its life, and this is the teacup. They are genetically weaker than a standard chi, and my understanding is that a responsible breeder will stop a line if a bitch starts throwing genetically weak pups.

I totally agree, the things people will do for money makes me really sad.