By Carol Beuchat PhDThere is a most unusual cancer that occurs only in dogs. Not only is it contagious, it is also the oldest cancer in the world.By oldest, we don't mean we've known about it the longest. When a dog has this form of cancer, the tumor cells themselves are 11,000 years old!The cancer is canine transmissible venereal tumor (CTVT), and it was first described by a Russian veterinarian named Mstislav Novinski in the 1870s. It is called a transmissible cancer because it is contagious, [...]
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