Oscar the cat seems to have an uncanny knack for predicting when nursing home patients are going to die, by curling up next to them during their final hours. His accuracy, observed in 25 cases, has led the staff to call family members once he has chosen someone. It usually means they have less than four hours to live. He doesn't make too many mistakes. He seems to understand when patients are about to die," said Dr. David Dosa in an interview. He describes the phenomenon in a poignant essay in [the July 26] issue of The New England Journal of Medicine. "Many family members take some solace from it. They appreciate the companionship that the cat provides for their dying loved one," said Dosa, a geriatrician and assistant professor of medicine at Brown University. The 2-year-old feline was adopted as a kitten and grew up in a third-floor dementia unit at the Steere House Nursing and Rehabilitation Center. The facility treats people with Alzheimer's, Parkinson's disease and other illnesses. After about six months, the staff noticed Oscar would make his own rounds, just like the doctors and nurses. He'd sniff and observe patients, then sit beside people who would wind up dying in a few hours. Dosa said Oscar seems to take his work seriously and is generally aloof. "This is not a cat that's friendly to people," he said. Oscar is better at predicting death than the people who work there, said Dr. Joan Teno of Brown University, who treats patients at the nursing home and is an expert on care for the terminally ill. Most families are grateful for the advanced warning, although one wanted Oscar out of the room while a family member died. When Oscar is put outside, he paces and meows his displeasure. "