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Biewer Yorkshire Terrier Mini Biewers must be socialised and mentally stimulated every day starting at a young age. If they are left on their own for a long time they could develop separation anxiety. This breed was developed in Germany when Yorkshire Terrier breeders discovered a genetic recessive gene in one of their puppies. It has now evolved into a distinct breed. Health Tests for Health The Biewer Yorkshire Terrier is a rare breed that was developed in 1984 in Germany by a genetic mutation. It is known for having a tri-co