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I can honestly say your dog is as inbred as it's English counterpart.
I am sure even you can work out the math on how many dogs have come to this country vrs how long they have been here.
You can count them all on two hands and now divide that by 30 years, having no papers means very little as this breed has been playing kissing cousins for decades........and they do fall to bits faster if you try using them for what they were designed for.
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But your dog came about from exactly the same weird practices, to think otherwise is just silly, it's well documented, you only have to look with both eyes open and not get too hung up on breed standards, dog registries or kennel clubs.
At one stage the breed was almost extinct.....them southern boys wrote the book on incest and not just with the dawgs.