Most dog owners will do just about anything for their pets—buy ridiculous chew toys, cook gourmet meals, maybe even let them take over half the couch. But one Australian entrepreneur took devotion to an entirely different level after his dog was diagnosed with terminal cancer. Instead of accepting the prognosis, he turned to artificial intelligence, genetic sequencing, and a crash course in biotechnology to design a personalized cancer vaccine. The result? His dog’s tumors shrank dramatically and she went from slowing down to jumping fences again. It’s a story that sounds like a sci-fi movie, except the hero isn’t a scientist—it’s a guy who just refused to give up on his best friend.