@jengosmonkey some breeders give no support and no back up to new owners. And they refuse to take back any puppies they have clearly sold to homes where no Basenji should ever have been placed.
Potential owners are not vetted, parents are not identified and seldom are health tests done.
Owners pay their money over, collect their puppy and are on their own.
We call these people puppy farmers. You call them puppy mills. I think @tanza and I both have a suspicion as to where this pup originated. I doubt the owner paid anything like 4000 for it, so he or she is not much better. Trying to make a profit instead of finding a loving home for the wee animal.