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Biewer Yorkshire Terrier Mini Biewers must be socialized and stimulated mentally every day from a young age. They are prone to developing separation anxiety if they are left for long periods of time. This breed was created in Germany when Yorkshire Terrier breeders discovered a genetic recessive gene in one their puppies. It has evolved into an individual breed. Health Tested The Biewer Yorkshire Terrier, a rare breed, was developed in Germany through genetic changes in 1984. I