When do Xoloitzcuintlis stop growing?

Xoloitzcuintli dogs typically reach their full size and stop growing by the time they are around 12 to 18 months old. During the first year or so of their lives, Xolos will undergo significant growth and development, both in terms of size and physical maturity. After reaching adulthood, they will maintain their size and physical characteristics, although they may continue to fill out and mature mentally over the next few years.