U can always begin DS/CC with him present, but not close by, or at least in eyeshot, later - for now, despite the barks, i'd get him out of the room.
Literally sh!tting himself is far-too intense fear to be in the same room. DS/CC - DeSensitize / Counter-Condition
- is controlled low-level exposure with happy things added, whenever the trigger stimulus occurs
, such as tethering at the extreme end of the room or in an adjacent room, perhaps so the dog can see the visitor only if the dog chooses to stand - if they DON'T want to see the stranger, or for the stranger to see them, they can lie down & pretend there's no dog, here.
Some spooky dogs prefer to lurk, vs be seen.
Meanwhile, so long as the visitor is present, pea-sized or half-pea sized tidbits rain on the timid / reactive dog.
A variation of Treat / Retreat that throws the tidbit PAST a tethered dog can be used, too - but for now, he's too upset. // Yes, ya gotta start somewhere
, but for now, i'd start with him in another room, ONE person familiar to him with him, & the other person with the visitor, in the living / dining area.
The person with the dog does Open Bar / Closed Bar
: so long as the visitor is here, either visible or audible or even scent-able, FEED THE DOG in a steady stream of tiny bits of meat-based cat kibble, finely diced beef / chkn brst / turkey / etc, scissored cubes of freeze-dried beef liver, lamb lung, whitefish, etc.
He can eat his dinner - but feed it one piece at a time, *not* in a bowl, & alternate the Good Stuff with the "ordinary" food - i do mean alternate, as in every other piece
is meat / cat-kibble with meat as the 1st ingredient / freeze-dried tripe, or some other gourmet item.
He's terrified if he's losing bowel control, & exposing him to something that frightening will not help him cope; rather, it's liable to make him sensitized / even more reactive, which is what may be happening, in this instance.
He cannot flee, he's trapped in the house, he freaks out, & his anal sphincter fails.
Baby steps get ya where U're going faster than going too quickly for the dog's ability to cope.