
I always say that
there is no good reason to not register a purebred litter.
Most often the parents are unregistered, have breeding restrictions, not owned by the breeder (even stolen). The bitch may already have had too many litters.
So yes a pedigree should be KC registered as a start.
Then they should have ALL breed appropriate Clinical and DNA health testing, and have acceptable results, and mated to appropriate partners based on DNA test results.
Sadly KC registration of itself is no guarantee of quality, as it only means bith parents were registered, and had no breeding restrictions and the bitch was within age parameters, not had 4 litters or was sister or offspring, or mother of the sire.
Those signed up for their Assured breeder program may have to do some basic health testing for their breed and will have had their premises and record keeping checked.