How to make my pitbull get bigger?

I WOULDNT ADD ANYTHING LIKE POWDER TO MY DOGS FOOD, THE BEST THING YOU CAN DO IS GIVE YOUR DOG LOTS OF PASTA AND RICE BUT ADD NO SALT OR ANYTHING TO IT AND FRY IT ANY KIND OF MEAT BUT FRY IT IN WATER, MY DOGS LIVE OFF PORK CHOPS, BEEF, PASTA AND RICE AND DONT LET ANYONE TELL YOU ANY OF THIS IS BAD FOR THEM. YOU CAN SEE HOW GOOD MY DOG LOOKS AND HER MUM WE HAD BEFORE HER LIVED UNTIL SHE WAS 18 IN HUMAN YEARS, SHE WAS A FEW WEEKS FROM HER 19 BIRTHDAY!! ALSO FOR NORMAL DOG FOOD NOT SURE IF YOU HAVE WHERE YOU ARE BUT IN THE UK WE HAVE A DOG FOOD CALLED BUTCHERS TRIPE, BUT ANY TRIPE FROM YOUR BUTCHER WILL DO ITS GREAT!! WE HAVE USED IT ON ALL OUR DOGS!! AND THEY HAVE GOT HUGE MUSCLES, ALSO WITH THIS KINDA DIET IF you WANT THEM BIG, YOU MUST TAKE THEM TO OPEN SPACES SO THEY HAVE PLEANTY OF ROOM TO RUN WILD!! JUST WALKING THE DOG WILL DO NOT GOOD!! HOPE THIS HELPS