Boxer's tail cropped too long?

Dock length should not affect the puppies ability to sit properly. The puppy has the same mobility in the docked tail as it would in a full length tail. If the puppy is unable to move the tail out of the way to sit properly the the problem is with the tail carriage or the development of the muscles that allow her to move the tail and not with the length of the dock (sounds like she has the standard longer Boxer dock)