7 years old! The cloned offspring of the world's first cloned dog have been made public

of three cloned offspring of Snoopy, the world's first cloned dog, at 2 months old. Source: Scientific Reports
According to Physicists Network 22, the South Korean scientists who bred the world's first cloned dog, Snoopy, recently published a paper in the journal
saying that they In 2010, in collaboration with U.S. scientists, four second-generation cloned dogs were successfully bred using stem cells from 5-year-old Snoopy, and three were still healthy at 9 months of age, except for one that died a few days after birth. These 7-year-old cloned dogs will provide scientists with unique research opportunities to compare the health and longevity of cloned animals with those of parents who provide sobody cells.
Dogs, unlike other mammals, have a complex reproductive system, with only two ovulation sessions per dog per year, and the excreted egg cells have to stay in the fallopian tubes for a few days before they can mature, which makes it difficult for dogs to clone. So, while other animals have been successfully cloned by scientists, cloned dogs were first introduced in 2005. At the time, the Hwang Kyo-sik team at Seoul National University took animal cloning to new heights by cloning the world's first cloned dog, Snoopy, using the body cells of the Afghan hound Tai.
This time, South Korean scientists worked with scientists at the University of Michigan and the University of Illinois at Urbana-Champaign to extract stem cells from five-year-old Snoopy and use somatic cell nuclear transplantation to create 94 transplantable embryos that eventually gave birth to only four offspring, one of which died a few days after birth. The published paper was written by scientists when three other cloned dogs were nine months old, and for various reasons they were not made public until they were seven years old.
since the birth of the world's first cloned animal, the cloned sheep Dori, the debate over whether cloned animals live a long and healthy life has not stopped, and scientific research has so far failed to give a clear answer. According to the paper, Snoopy and Tai lived to 10 and 12 years, respectively, about the same age as Afghan hounds with an average life expectancy of 11.9 years. Now we've tracked the two clones clinically and molecularly, monitored their disease development, immune system, metabolism and development in all its aspects, and will compare them with Snoopy's health, which may shed light on the health of cloned animals. (Source: Science and Technology Daily