How many months does it take for a Border Collie to become an adult?

A Border Collie is considered an adult dog when it is 12 months old. The Border Collie’s growth will slow down after ten months, and will be fully developed by about one and a half years old. The Border Collie's shoulder height and body length will be finalized when it is about one and a half years old, so it is necessary to supplement the Border Collie's body with nutrition. In addition to feeding nutritious food, you can also use nutritional paste, which can be fed directly or mixed into food. Border Collies must also be dewormed regularly, as parasites will absorb the nutrients of Border Collies.