PUPPY SIBLINGS

Question
THE KENNEL CLUB BOOK (CHARLOTTE SCHWARTZ) SAYS THAT A PUPPY MUST BE REMOVED FROM THE BIRTH PACK.  IF THE PUPPY IS LEFT WITH HIS LITTERMATES TO LONG HE/SHE WILL NEVER DEVELOP A STRONG RELATIONSHIP WITH PEOPLE.
   I HAVE NEW FEMALE MORKIE PUPPIES SIBLINGS 9 WKS OLD. ONE VERY DOMINANT AND ONE SUBMISSIVE, THEY FIGHT ALL OF THE TIME. I SEE THE SUBMISSIVE PUPPY BECOMING LESS SOCIAL AND MORE TIMID. SHE DOES FIGHT BACK AND MANY TIMES WILL KEEP THE FIGHT GOING AFTER IT WAS ONCE STARTED. SHE ALSO IS LESS RESPONSIVE TO POTTY TRAINING.
 THEY ARE TOGETHER ALL THE TIME AND EVEN IN THE SAME CRATE. THE FIGHTING GETS VICIOUS,HOW DO I STOP IT, DO I STOP IT? DO I SEPARATE THEM AND IF SO, TO WHAT EXTENT? HOW DO I GET THE TIMID PUPPY TO BECOME MORE LOVING AS SHE WAS WHEN I GOT HER? THE OTHER PUPPY IS VERY LOVING AND SOCIAL.
 I LOVE MY PUPPIES AND I WANT TO DO THE RIGHT THING.  CAN YOU PLEASE HELP ME?
                   THANK YOU
                    DEBORAH SOBOLESKI

Answer
Many advise against raising siblings together.  You will need to take special steps to make sure they bond to you as well as each other.  

''Elevation for small puppies: Sit on the floor and gently put your hands around your pup's middle, below his front legs, and lift him up. He is facing you. Hold him for 15 seconds. Repeat until he no longer struggles. If he is past 10-12 weeks, lift his front feet off the ground, but don't pick him up.

Cradling for small puppies: Hold your puppy gently on his back, as you would cradle a small baby. If he struggles, hold him firmly until he quiets for 10-15 seconds. With larger pups, you can do this as your sit on the floor, with your pup between your legs.

Quiet lying down: Place your pup on the floor on his side, with all 4 legs pointing away from you. Use your hands on his neck/shoulder area and middle, to hold him in this position. When he is quiet, praise him. Lengthen the time that you keep him quietly in this position. When he accepts this position well, handle his paws and muzzle, while keeping him quiet.''

The quotes mean this isn't my original work. It is copied from my Puppy Raising Manual. I have long used these or minor variations of them, and they are very effective. You may want to give him a belly rub while he is on his back too. Helps bonding. There is a big difference between him rolling over and demanding a belly rub, and you choosing a time to roll him over and rub his belly. The latter cements your place as pack leader.

It is hard to sort out rough play and real fighting.  Low, rumbly growls, quick short snaps, and one puppy fleeing and not coming back for more are bad signs meaning it is time to step in and settle things.  Often a time out works.  I would also use separate crates.