This extinct dog breed gets its name because of the bluish tinge it had on its coat, and from the sailor John Paul Jones who is believed to have brought it to Scotland. In the mid-1800s, these dogs participated regularly in the erstwhile sport of dog fighting. Researchers studying a species of wild dog have discovered that it closely matches the DNA of a species thought to be extinct. It had a muscular and powerful build, and was a strong and ruthless fighting dog. Watch: Ancient Wild Dog Population Feared Extinct, Now Captured on Camera Unseen for more than 50 years, the New Guinea highland wild dog has at last been confirmed in its natural island habitat. A rare dog breed that was thought to be extinct in the wild for the last 50 years could actually be thriving. T he distinct, mournful howl of a highland wild dog was once a mainstay in Papua, but for the past 50 years, scientists had considered them extinct in the wild. List of the Extinct Dog Breeds The dog received its unusual name because of its high-pitched barking sounds and howls that has been described as a “wolf howl … At the same time, in the wild, some species like the African wild dog face the verge of extinction because of a high incidence of deadly diseases, habitat loss, struggling to find food etc. The New Guinea singing dog was said to only exist in captivity, but a DNA analysis found its predecessor, the Highland Wild Dog, is thriving in Indonesia after being believed to be extinct. The New Guinea singing dog was thought to have been extinct in the wild for the past 50 years. This could mean good … Despite anecdotal reports and unconfirmed photographs in recent years, many feared the New Guinea highland wild dog had become extinct through loss of habitat and mixing with feral village dogs. The only remaining members of the canine species were the ones that were taken care of in captivity. African wild dogs are becoming extinct for a number of reasons. Fewer than 300 of their domestic counterparts, commonly called New Guinean singing dogs, are held in captivity across the globe, and their numbers … After decades of fearing that the New Guinea highland wild dog had gone extinct in its native habitat, researchers have finally confirmed the existence of a healthy, viable population, hidden in one of the most remote and inhospitable regions on Earth. They have a lot of competition with other animals like lions and hyenas, so searching for food can be a struggle. In fact, it seems that the closest wolf ancestors of today's dogs may have gone extinct, leaving no wild descendants. So they hunt livestock and this causes farmers and ranchers to deliberately kill the wild dog.