I would have said it was impossible until a month ago.
Ten years ago a neighbor began to feed a cat that showed up. He fed him for four years and died. his wife took over and than we took over when she became ill. Cat would never come in anyones house. We were gone to much and the man next door took over feeding him. The weather turned awful a month ago and when he opened the door to feed the cat, it scooted into his house. Buster has been an indoor cat ever since. Perhaps he was an indoor cat ten years ago but for the last ten years he had been an outdoor cat.
And our Opie was an indoor-outdoor cat when we adopted him. He learned that he was not allowed outside unless he was on a leash after several months and did not try to get out altho we watched carefully to make sure he did not get out at campgrounds unless he was tied up.
