The champ, appropriately, is called Rocki. The perky pregnant Norwich terrier, officially named Fairewood Frolic, sashayed to Best in Show honors on Tuesday night in dogdom’s Olympics, the 122nd Westminster Kennel Club Dog Show at Madison Square Garden in New York. The quick-stepping Rocki appearing for the first time in the Westminster show defeated six other brushed, primped and prettified rivals who managed to stay on all fours while 2,493 others, all champions when they trotted in, ended up out of the running. Her owners, Glorvina and Alexander Schwartz of Tuxedo Park, N.Y., think Rocki has earned the right to dog it a bit. They said she’ll become a mother - her due date is April 1 - and then retire to life as a house pet.