What happened to man-made objects/structures:
While some things have disappeared all together as Dorses no longer needed them, others have either been left alone or altered for dorses. Most unaltered/altered have no changed backstory, so if a dorse asks another dorse something like, "How are power drills made," the other dorse will shrug it off and say, "Who cares, let me fuck your ass." Then the first dorse will say, "Okay, sick," and then they'll fuck and forget about the question.
How do dorses use objects:
They mainly manipulate things with their mouth and very long, prehensile tongue. The tongue can become adhesive whenever the dorse will's it to be. They can also push and pull some things with their legs.
(Any chapter by NothingsHere adheres to this lore and will sprinkle new pieces of worldbuilding throughout)