Teacup dog does not refer to one specific breed. Any dog whose adult height is under eight inches and whose weight is under four pounds may be classified as a teacup dog. In other words, the most important selection standard for a teacup dog is simply being tiny. Precisely because they are so small, teacup dogs are at risk for many health problems.
Hydrocephalus
The most common disease in teacup dogs is hydrocephalus. This happens when too much cerebrospinal fluid is produced in the cranial cavity, or when circulation and absorption are impaired. As a result, the amount of fluid in the skull increases, causing elevated intracranial pressure. This may make the eyes bulge, give the dog a tense expression, and make it more vulnerable to stress reactions. In some severe cases, the dog may even have difficulty holding its head steady or walking normally.
Heart Problems in Teacup Dogs
A teacup dog's heart is very small, and each heartbeat can already be a burden on such a tiny body. The heart has to beat faster to supply blood to all the underdeveloped parts of the body, and because of that, heart disease can easily develop.
Cardiopulmonary Function
Weak cardiopulmonary function means inadequate oxygen supply, breathing difficulty, and various heart-related diseases. At the same time, teacup dogs are often affected by hydrocephalus, hypoglycemia, fragile bones, tracheal collapse, and many other problems.
Digestive System
Because teacup dogs have such small and delicate stomachs, they cannot eat much at one time and need to be fed small meals more frequently. Frequent eating combined with little or no exercise can lead to unhealthy body weight. Smaller dogs are also more likely to develop hemorrhagic gastroenteritis. Taken together, these factors make the digestive system of the teacup dog extremely fragile.
Teacup dogs are sold at extremely high prices because of their tiny size, but that same tiny size is also the source of their tragedy. Most of the common illnesses described above are directly related to their unnatural smallness. If you feel unable to accept these risks, then it is better not to keep a teacup dog.