Reset the doorway as a system rather than scolding the dog. A delivery bag arrives smelling of other houses, other hands, and often food, it lands in the exact spot your dog already believes is his to patrol, and biting it once has taught him that parcels are worth claiming. After that, every knock and rustle rehearses the same sequence: arousal at the door, a prize on the step, and a dog guarding that prize against anyone who reaches for it. The routine changes when the geography changes.
Stop Parcels Landing in Dog Territory
Start with the deliveries themselves. Add delivery instructions asking drivers to leave parcels beyond your front gate, beside the garage, or in another spot your dog never accesses. A lidded delivery box fixed outside the dog's area works well, because it removes both the sight and the smell trigger from the doorstep. If parcels must come to the door, collect them before the dog is let into the hall, every time, with no exceptions for quiet days.
Inside, put a physical barrier between the dog and the front door: a stair gate, a closed internal door, or a pen in the hall. The barrier matters more than any command, because a dog who cannot reach the step cannot rehearse guarding what lands on it. Until the new routine holds, the dog goes behind that barrier whenever a delivery is due, a visitor knocks, or anyone opens the front door.
Practise the New Sequence in Training Mode
Rehearse when nothing real is at stake. Have a household member knock, then cue your dog to his mat or bed behind the barrier, reward him there with something excellent, and only then open the door and carry a practice parcel in yourself. Repeat the whole sequence in short, cheerful sessions until going to the mat at a knock becomes the automatic first move. Everyone in the house practises the identical sequence, in the identical order.
If a real parcel is ever guarded despite the system, do not reach in, loom over him, or pull the parcel away; that confirms his belief that people near parcels are a threat. Throw a handful of exceptional food well away from the parcel, let him leave it to eat, close a door between him and the step, and collect the parcel calmly afterwards. Note what arrived, where it was left, and how he reacted, because that tells you which part of the system leaked.
When Guarding Is Spreading
Doorway guarding that stays narrowly fixed on delivery bags, under a solid barrier routine, usually fades as the rehearsals stop. Guarding that spreads — to post, shopping bags, visitors' belongings, or people standing near the dog — or that appears alongside stiffness, hard staring, or snapping when anyone passes, needs professional eyes. Ask your vet to check for pain first, since sore dogs guard more readily, and then work with a qualified behaviourist on a plan for your hallway, not a generic one. Keep children entirely out of the doorway routine until that assessment has happened.
The goal is boring deliveries: a knock, a dog settling behind a gate, and a human quietly bringing in a box he never gets to claim. Include the post in the same rehearsal, because letters pushing through the door belong to the same doorway picture for many dogs, and the mat response should cover both sounds. KinsLe Care Teams makes that boredom easier to hold across a busy household, because you can assign the daily parcel check and the gate routine to whoever is home first and see each completed task marked with a timestamp.