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Biewer Yorkshire Terrier Mini Biewers must be socialised and mentally stimulated every day from a young age. If left unattended for a long period of time they could develop separation anxiety. The breed was developed in Germany after Yorkshire Terrier breeders discovered a pibald recessive genetic mutation in one of their pups. It has developed into a distinct breed. Health Tests The Biewer Yorkshire Terrier is a rare breed that was developed in 1984 in Germany through an genetic mutation. It