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  While DNA and other requirements do help enforce the rules, every registry depends, to a certain extent, on the honor system.  I know breeders (sadly) who wait until the last possible moment to submit their AKC litter regs so that they can choose a birthdate that makes the puppy's weight look good.  I have an AKC male who looks like a poodle (he cannot be purebred by any stretch of the imagination).  Even the AKC DNA registration for frequently used sires can be faked...who's to say which dog's cheek you swab?
 My point is not that the AKC isn't good, the point is that NO registry can guarantee anything 100% either way.  Saying that dogs from another registry are definitely the product of bad breeding is as incorrect as saying that all AKC dogs are well-bred.
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