Can a dog/bitch entered in Minor Puppy, Puppy, Junior and/or Yearling classes at championship or open shows go in the ring for Bitch/Dog CC or Reserve Bitch/Dog CC if won one or more of these classes?

What classes can a puppy qualify to go against other dogs for Best Puppy in breed or show?

All winners of all classes are brought into the ring for the CC "run off".  Dogs have won CCs from puppy classes in some breeds.

There aren't CCs on offer at Open shows, but all class winners compete for Best of Breed.

Just to clarify the information given already - a class winner is eligible to challenge for CC/BOS/BoB (depending on classification/show) only if it is unbeaten in any other classes.  You cannot, for instance, go in to challenge if you have won junior and yearling, but been beaten in Post Grad.  It is unbeaten dogs who challenge, only.  So ALL class winner don't automatically qualify to challenge if they have competed in more than 1 class.
bye
Gwen

A puppy can be elligible to compete for Best Puppy in Breed (BPIB) by winning any class scheduled for the breed. A puppy can be beaten by an adult and still be elligible, but when a puppy is beaten by another puppy, then it can't compete for BPIB. So technically, you can enter a puppy in the open class and be beaten by three adults and still compete for BPIB.

Dawn R.

And of course a puppy can also win BOB at a Champ. show and win a CC!