Arlyn Anderson grasped her father’s hand and presented him with the choice. “A nursing home would be safer, Dad,” she told him, relaying the doctors’ advice. “It’s risky to live here alone—”

“No way,” Jim interjected. He frowned at his daughter, his brow furrowed under a lop of white hair. At 91, he wanted to remain in the woodsy Minnesota cottage he and his wife had built on the shore of Lake Minnetonka, where she had died in his arms just a year before. His pontoon—which he insisted he could still navigate just fine—bobbed out front.

Arlyn had moved from California back to Minnesota two decades earlier to be near her aging parents. Now, in 2013, she was fiftysomething, working as a personal coach, and finding that her father’s decline was all-consuming.

Her father—an inventor, pilot, sailor, and general Mr. Fix-It; “a genius,” Arlyn says—started experiencing bouts of paranoia in his mid-eighties, a sign of Alzheimer’s. The disease had progressed, often causing his thoughts to vanish mid-sentence. But Jim would rather risk living alone than be cloistered in an institution, he told Arlyn and her older sister, Layney. A nursing home certainly wasn’t what Arlyn wanted for him either. But the daily churn of diapers and cleanups, the carousel of in-home aides, and the compounding financial strain (she had already taken out a reverse mortgage on Jim’s cottage to pay the caretakers) forced her to consider the possibility.

Jim, slouched in his recliner, was determined to stay at home. “No way,” he repeated to his daughter, defiant. Her eyes welled up and she hugged him. “OK, Dad.” Arlyn’s house was a 40-minute drive from the cottage, and for months she had been relying on a patchwork of technology to keep tabs on her dad. She set an open laptop on the counter so she could chat with him on Skype. She installed two cameras, one in his kitchen and another in his bedroom, so she could check whether the caregiver had arrived, or God forbid, if her dad had fallen. So when she read in the newspaper about a new digi­tal eldercare service called CareCoach a few weeks after broaching the subject of the nursing home, it piqued her interest. For about $200 a month, a human-powered avatar would be available to watch over a homebound person 24 hours a day; Arlyn paid that same amount for just nine hours of in-home help. She signed up immediately.

A Google Nexus tablet arrived in the mail a week later. When Arlyn plugged it in, an animated German shepherd appeared onscreen, standing at attention on a digitized lawn. The brown dog looked cutesy and cartoonish, with a bubblegum-pink tongue and round, blue eyes.

She and Layney visited their dad later that week, tablet in hand. Following the instructions, Arlyn uploaded dozens of pictures to the service’s online portal: images of family members, Jim’s boat, and some of his inventions, like a computer terminal known as the Teleray and a seismic surveillance system used to detect footsteps during the Vietnam War. The setup complete, Arlyn clutched the tablet, summoning the nerve to introduce her dad to the dog. Her initial instinct that the service could be the perfect companion for a former technologist had splintered into needling doubts. Was she tricking him? Infantilizing him?

Tired of her sister’s waffling, Layney finally snatched the tablet and presented it to their dad, who was sitting in his armchair. “Here, Dad, we got you this.” The dog blinked its saucer eyes and then, in Google’s female text-to-speech voice, started to talk. Before Alzheimer’s had taken hold, Jim would have wanted to know exactly how the service worked. But in recent months he’d come to believe that TV characters were interacting with him: A show’s villain had shot a gun at him, he said; Katie Couric was his friend. When faced with an onscreen character that actually was talking to him, Jim readily chatted back.