A door problem, not a whole-day separation problem
A dog who becomes frantic when someone pops out to the car or the bins is reacting to the departure itself — the keys, coat, door handle, and the sight of a person crossing the threshold — rather than to being alone for long stretches. He may cope contentedly once a leaver has been gone ten minutes, yet lose control in the first thirty seconds. That distinction decides the training: the work is hundreds of tiny, dull exits and returns around the front door, not leaving him alone for gradually longer hours. Treating it as general separation anxiety and starting with long absences misses the moment that actually frightens him.
Strip the drama out of leaving cues
Begin without leaving at all. Throughout the day, pick up keys and put them down, put on your coat and make tea in it, touch the door handle and go back to the sofa. Your dog learns that these signals usually predict nothing, so his adrenaline stops spiking at the jingle of keys alone. Family members should drop departure and return rituals too: no long goodbye cuddles at the door, no excited reunions — arrivals home are greeted calmly after a moment, so the doorway stops being the emotional peak of his day.
Rehearse exits measured in seconds
When the cues are boring, step outside, close the door, and come straight back in before he has time to escalate. Repeat many times, adding a few seconds only while returns still find him unsettled-but-coping rather than frantic. Vary who leaves — the trigger is often strongest for one particular person, and that person needs the most repetitions at the shortest durations. If he barks, scratches, or drools the moment the door closes, the step was too big; shorten it until he can succeed, because rehearsing panic at the door teaches panic at the door.
Give the waiting side of the door a job
Once he can handle brief exits, leave something absorbing on his side as the door closes: a lick mat, a filled chew, or a scatter of treats in the hallway rug to sniff out. Present it as part of the exit routine so the door closing starts to predict good things arriving rather than his person vanishing. Early on, the person remaining in the house can stay near him without interacting much, then fade their presence too, so he is not simply transferring his door anxiety onto whoever stayed behind.
Know when door panic needs more help
Get his vet involved if the frantic behaviour includes injuring himself on the door, drooling heavily, toileting despite being house-trained, or refusing food while anyone is out — that intensity suggests genuine separation distress beyond a door habit, and training alone may not be a fair ask. A referral to a qualified behaviour professional is also worthwhile if weeks of second-by-second practice stall at the same duration. Meanwhile, manage real life honestly: if someone must leave for an hour before he is ready, arrange company for him rather than letting one real departure undo a fortnight of tiny successes.
Share the repetitions across the household
This programme lives or dies on volume — many short, calm exits every day — and no single family member can supply them around work and errands. Splitting the door rehearsals, cue-desensitising, and hallway-chew duties between everyone, with each day's practice marked off, keeps his progress steady and shows honestly which person's exit still triggers him. KinsLe Care Teams keeps that rota with his other care tasks, so the whole household is quietly training the same front door.