Halloween is not one knock, it is dozens, from dusk until late, and every one of them opens the door a little wider onto a street full of costumes, masks and children.
That is a hard evening for a dog who already finds one doorbell exciting. It is also an evening with a bowl of sweets at nose height and an open door your dog could slip through, so tonight is a management problem first.
Each knock on its own might be nothing. Dozens of them, back to back, with the door opening onto a different costume every time, add up to an evening unlike any other night of the year, and that is true even for a dog who copes fine with one visitor at a time.
Children at the door bring their own version of the same problem. They are smaller, louder and move less predictably than an adult visitor, and some dogs who are relaxed around adults are unsettled by children they do not know, especially in a mask.
Pick one setup before dusk
Decide which of these you are doing before the first knock, rather than improvising at 6pm. Any of them works. Switching between them halfway through the evening is what goes wrong.
Sit outside with the sweets bowl yourself, so the front door never needs to open at all.
Put a sign on the door asking people not to knock or ring, and leave a bowl on the step instead.
Keep your dog in a quiet back room with a chew and a radio or television on, away from the front of the house.
If your dog is anywhere near the front door
Put a baby gate across the hallway, or close the interior door, so the front door is never the only barrier between your dog and the street.
Keep a leash on your dog's harness any time they are in the hallway or living room with the front door in use.
Walk and feed your dog earlier than usual, before dusk, so they are not hungry or short of a walk while the knocking starts.
Walking and feeding before dusk matters more than it sounds. A dog who is tired and fed is easier to settle than one who is still waiting for the evening's main event when the knocking begins.
If young children ring the bell and your dog is present rather than behind a gate, keep the leash short enough that your dog cannot reach them, and step between your dog and the group rather than letting the greeting happen on its own.
Tonight is not the night to work on the doorbell or on greetings. Working below the level that sets your dog off is the condition for learning near something that unsettles them, and a steady run of masked strangers at the door is well above it.
Behaviour change is built from management plus reinforcement together. Tonight calls for the management half only, and the training can wait for a quieter evening.
A few days ahead, if you want to practise
Ask a household member to put on a hat or a mask at a distance your dog stays loose and relaxed at, not a distance that makes them freeze or back away.
Reward your dog for noticing the hat or mask and staying settled, then stop. A short, calm session beats a long one.
If your dog startles or will not approach, keep more distance next time rather than asking them to get used to it up close.
Costumes on your dog, if you want to use one, only if they move and settle normally while wearing it. Take it off at the first sign of freezing, scratching at it or trying to escape it.
Safety note
Chocolate, sugar-free sweets and gum containing xylitol, raisins and sweet wrappers are all dangerous to dogs, and an open sweets bowl by the door is within easy reach all evening. Keep the bowl up and out of reach, bin wrappers straight away, and keep candles and glow sticks away from your dog. If your dog eats any of these, call your veterinarian or an emergency vet line immediately, even if they seem fine.
Tonight's version, in one line: pick one setup before the first knock, gate or leash between your dog and the door, and the sweets bowl out of reach all evening.