Registration papers should be proof, but without DNA confirmation one can never be positive. I know a breeder (in another breed) who was getting old and a bit confused and I am sure some of her pups' parents were not accurately attributed, but the pups were purebred, just possibly from different sire. Coat colour can vary tremendously and it's more likely when it isn't a disqualification in the breed. If you are buying a dog described as purebred then there should be registration papers given to you. A DNA test should tell you whether the dog is Basenji or mixed with something else, if you really want to know.
New puppy people and breeders
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http://www.patriciamcconnell.com/product/the-puppy-primer
Dr McConnell has a revised book out for those of you who have new puppies. I have not read this one, but based on the books of hers that I have read, I do not hesitate to suggest this one.
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I sent the earlier version of this book home with my puppies last year. I think it is a good addition to a new puppy owner's library.
