This is a picture of a hole the dog dug under the garage slab. There are no foundation walls, just the slab.
It’s a 1980s wood frame house in SE Georgia. (sandy soils, high water table)
There are no signs of settlement in the house - wall cracks, racked doors, etc. Even the concrete driveway has minimal cracking.
Was there ever a time when slabs were poured without walls and a footer? Is this foundation OK?