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Biewer Yorkshire Terrier Mini Biewers must be socialized and stimulated mentally every day from a young age. If left unattended for long periods of time they may develop separation anxiety. The breed was developed in Germany after Yorkshire Terrier breeders found a piebald recessive genetic mutation in one of their puppies. It has since evolved into its own distinct breed. Health Tests for Health The Biewer Yorkshire Terrier, a rare breed, was developed in Germany through gen