The breeding of miniature and teacup dog varieties causes significant welfare problems through extreme size reduction associated with fragile bones, organ abnormalities, hypoglycaemia and shortened lifespan.
Teacup dog breeding is a commercial welfare disaster in which extreme miniaturisation is achieved through selection of the smallest, sickest individuals — the very animals that would not survive in a welfare-positive breeding programme. The resulting animals suffer from a cascade of health problems inherent to their extreme size, spending significant portions of their short lives receiving veterinary treatment for preventable conditions. Consumer demand drives this market, meaning that welfare improvement requires both consumer education and, ideally, regulatory prohibition of breeding below established minimum healthy size standards. Buying a teacup dog directly funds continuation of the practices that cause these animals to suffer.