1: likely this is a troll, but there may be curious readers
2: Bostons are a naturally bobbed breed, no need to dock so what you have arnts pure bred bostons
3: tails should ideally be done no later than 3 days of age, while they can be done up to 5 days, 3 is best!
4: you would have noticed that this dogs tail had "grown back" if that were even possible, if it seems like its crown back you did a real bad dock job...
5: at this age its not DOCKING is AMPUTATION, and can only be done By a vet under a general anesthesia, theres a huge risk for infection now that mums not cleaning them throughly due to the location of the wound, and because of the puppies age a cone will have to be worn to stop him bothering it, a tail amputation also takes a stralgly long amount of time to heal.
after 3 days, tails should only be amputated if theres a medical need (ie broken tail)