I have questions

I’ve never run across this configuration of outhouses. Normally an outfit like “Porta-potty” supplies individual, self contained poopin’ boxes.

Would this row of, uh, outhouses, have individual pits? Or one oblong hole, quickly dug with a backhoe? And another thing, why do the dogs do their business in the same area? Can we blame the smell on Fido? It stinks so bad in there, the vent pipes are warped.