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How long were you when you were born and how tall are you now? Since the tail is a continuation of the spine, it grows in length, just like you grew, until fully mature. If you see adult dogs with short tails, either they have been docked, or a a natural bob tail breed such as the Bulldog.

different breeds are docked for various motives- some are finished so as that the tail can not be used to snatch the dogs if it relatively is attacking a human- for some, it relatively is docked to maintain it from getting caught in bramble, and so on.- for some, it relatively is docked so as that the animals being herded can not get ahold of the dogs by the tail- so, there's a historic clarification for tail docking. There are some breeds (Pembroke corgis)- that are born without a tail

The same way as the rest of him grows. Maturity - food!!