The most important thing to look for when buying a teacup puppy is health. Teacup dogs are prone to significant health issues due to their small size and the fact that they are often produced by unethical breeders who do not test for genetic health problems.
Teacup dogs are bred for an unusually small size, usually at the expense of other characteristics, such as conformation and temperament. Reputable breeders may occasionally produce unusually small puppies, but they typically charge less for them since the dogs do not meet breed standards. They also do not usually advertise them as teacup puppies, because "teacup" is not a term recognized by any breed registry. Rescue organizations focused on small breeds are another a safe, ethical source of teacup dogs.
Teacup puppies are prone to developing organ problems and respiratory issues. Some of them have brittle bones or soft spots on their heads, which puts them at risk of serious injury. Teacup dogs also have a high risk of hypoglycemia, which can become life-threatening if not managed correctly. People who plan to buy teacup puppies should ask to see proof of health testing for genetic problems, such as eye problems or joint dysplasia, and avoid any breeder who refuses to provide it or says it is unnecessary.