A Bengaluru-based startup called Dognosis is training dogs to detect cancer from human breath samples, using AI to translate the animals' reactions into diagnostic data. Fitted with sensor-packed 3D-printed helmets, 15 dogs analyse breath collected in sealed masks, with the system achieving over 90% accuracy across seven cancer types in a study of more than 1,500 participants published in the Journal of Clinical Oncology. The approach could offer an affordable early-screening tool in India, where one in nine of the country's 1.4 billion people are expected to develop cancer and many cases are only caught at an advanced stage, though independent oncologists say larger trials are needed before definitive conclusions can be drawn.