When we first moved to where the children now have their home, there was a dilute calico who was quite malnourished who we eventually decided had, yes, been a house cat. Best guess was she had belonged to the house that had burned down the year before we purchased our lot. We named her Turtle (her beiges and creams were reminiscent of a box turtle's colors native to the area, as we were in a sandy loam/pine area). She was very endearing, never tried to go inside (presuming trauma from the aforementioned fire), but had all the manners of an indoor cat.