Teacup dog is a mixed artifact of various weak and inferior genes.
As the saying goes, "natural selection, survival of the fittest", good genes will be passed on through the organism itself. Tea-cup dogs are inferior dwarfism genes forcibly inherited by human beings. In order to ensure the inheritance of this inferior gene, there will be a large number of inbreeding, which will lead to excessive activation of recessive genes in congenital diseases, weak self-resistance, and a large number of congenital diseases, and the natural survival rate is not high.
So, please resist the breeding of teacups. No market, no harm.
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