Canine transmissible venereal tumor developed roughly 11,000 years ago, and all cases seen today originate from a line of malignant cells that occurred in one dog, according to genetic research. The disease is one of only two types of cancer known to spread by contact between individual animals. Researchers traced genetic clues, finding the original carrier of the cancer was a husky-type dog that lived 11,000 years ago, and researchers uncovered markers of inbreeding, which could have facilitated the development of the disease.

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