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  The most accurate DNA tests are the blood tests from what I have understood are the Wisdom Panel.  My vet told me that the swabs are not accurate at all.  
 I had a DNA test done on my Cookie and she came up Yorkie and Border Terrier. I am quite sure that was accurate. I always knew she was a mix, but she had a wiry coat and I just knew something else was there...border terrier makes perfect sense.
 
 I have seen people get some very strange results from the swabs....
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