it is not breed related is in a individual dog thing while not common it is certainly not rare either.is this considered a common thing?
Before changing the feeding schedual given the age of the puppy I would have the owner answer thes basic quest.
Is the dog housetrained? how often is the dog deficating 1,2,3 time a day?
changing a schedual can upset the houstraining routine and klead to set backs. For a routine it is best to match then number of defications with the feedins but never less than 2. So if the dog is deficating 3 times a day by all means change. From 10 am to 6 pm 16 hours just moving to a more balance 12 hour seperation may be enough. Also a couple of cookies at bedtime ususal solves the problem as well you juest have to account for the extra calories at meal time.