Why do teacup dogs not grow up

The teacup dog is a normal dog genetic mutation produced by the breeders in the United States, gradually developed into the present-day model. After half a century of breeding, the Teacup’s size gene has been relatively stable, so it has not grown much, due to this gene. The small size of the teacup dog has resulted in a small number and amount of births, generally 1 to 2 per litter, and only 3 to 5 births in its lifetime, and it generally needs help to give birth manually. At the same time, the living environment of the teacup dog is more demanding, pay attention to warmth in winter to maintain the temperature; summer pay attention to ventilation, keep cool. Indoor cleaning, disinfection, dryness and cleanliness are also required.