Teacup or mini Boston terriers are not recognized as a dog breed. So-called "teacup" Boston terriers are often runts that can develop multiple health issues.The average size for a fully grown Boston terrier typically ranges between 15 to 17 inches in height and 10 to 25 pounds in weight.
The Boston terrier is classified as a small sized dog, but it has an average amount of energy when compared to other breeds. The Boston terrier breed was first officially recognized as an independent dog breed by the AKC in 1893. It is considered to be a Native American breed of dog.