In 1940, Russian scientists released a video of severed dog heads that were kept alive for several hours, wiggling their ears in response to sounds and even licking their mouths. The scientists claimed they could keep the animals alive by an artificial blood circulation system.
But that was just the first time scientists had created zombie dogs. In 2005, American scientists created another pack of zombie dogs. The team rapidly killed the dogs by flushing all the blood from their bodies and replacing it with oxygen- and sugar-filled saline, according to the researchers from the Safar Center for Resuscitation Research at the University of Pittsburgh.
Three hours later, the team gave the dogs a blood transfusion, and an electric shock. The dogs were resurrected, and while some had permanent damage, most were no worse for wear. The research, published in the Yearbook of Intensive Care and Emergency Medicine, suggested that the treatment could one day revive people who are hemorrhaging blood too quickly for doctors to repair their injuries.