Some interbreeding with other breeds took place in the mid-1800s, which may have introduced Dachshund blood into the breed, although certain breeders maintained pure-bred lines. The Dachshund theory was first introduced by John Henry Walsh under the pseudonym of 'Stonehenge' in the 1880s, and was denied by many breeders of that era. By the mid-1800s, the breed was known as the Dandie Dinmont Terrier, and became sought after for hunting after Scott's writings were published. They remain the only dog breed to have been named after a fictional character. Around this time the breed had some involvement in the development of the Bedlington Terrier.
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