Teacup Yorkshire terriers, also called Yorkies, weigh an average of 3 to 4 pounds and stand 6 to 7 inches tall. They are approximately four pounds less than an average-sized Yorkie, which weighs about seven pounds.
Teacup Yorkies are bred with the runt of a Yorkshire terrier litter to achieve their tiny stature. Due to this small size, they often have health issues, such as seizures, chronic pelvic pain syndrome, heart disease, hypoglycemia and fontanels. Teacup Yorkies also have the standard Yorkshire terrier risks, including eye infections, poor digestion, bronchitis and early tooth decay. Teacup Yorkies are friendly and energetic, enjoying daily walks and play. Teacup Yorkies get overly energetic if they do not get sufficient exercise throughout the day.
Adult dogs which are smaller than 4 pounds cannot be exhibited in dog shows as Yorkshire terriers, as they are outside the breed standard. This is to prevent the propagation of genetic health problems within the breed, to which smaller dogs are more prone. The Yorkshire terrier breed itself is considered a toy breed.
The term "teacup" is used to describe an adult Yorkie that weighs fewer than 4 pounds. However, according to breed standard, a Yorkshire Terrier typically weighs under 7 pounds and is considered a small breed dog regardless of its weight. Famous for her small size is Sylvia, an English Yorkie who was the smallest dog in recorded history as of 2014. She weighed just 4 ounces and stood 2.5 inches tall.