A sleepover is not one big event for your dog. It is a long string of small surprises: the doorbell at an hour when the house is usually still, sleeping bags dragged past her bed, whispered trips to the kitchen, and a bathroom queue forming in a hallway she normally has to herself. Preparation works best when you break that string apart and rehearse each piece while nothing is actually at stake.
Give her a retreat that stays hers all night
Choose the room your dog already relaxes in most easily and make it unmistakably hers for sleepover nights — her bed, a water bowl, something that smells of the household, and a door that can close without locking her away from choice. The retreat fails if teenagers drift in to stroke her whenever they are bored, so the rule is simple and kind: a dog who has taken herself off is left alone, and anyone who wants to say hello waits until she comes out to them.
Rehearse the strange sounds before they are real
On two or three ordinary evenings, recreate sleepover noise in miniature. Have family members arrive at the front door after dark, carry bags through the hall, and talk and laugh in the room next door while your dog settles in her retreat. Keep each rehearsal short, let her investigate if she wanders out calmly, and pair the sounds with the ordinary good things that happen in that room — her evening chew, a calm stroke, then being left in peace. If she barks at the first doorbell, do not scold or fuss; wait for a pause, send her to her bed with the cue she already knows, and reward the settle. You are teaching her that late noise is background, not a job she has to handle.
Brief the teenagers like hosts, not bystanders
Your teenager and their friends need three instructions before the first guest arrives. First, ignore the dog when you come in, however pleased she seems — greetings happen later, once coats and bags are down. Second, food stays in the kitchen and living room, because a dog hoovering up dropped snacks at midnight will be restless all night. Third, bedroom and bathroom doors get closed gently rather than slammed, and anyone getting up in the night moves slowly past her bed instead of stepping over her in the dark.
Plan the late hours, not just the arrival
Most sleepover stress builds after midnight, when tired teenagers get louder and your dog's own sleep is broken in bursts. Build in a proper last garden visit before the film or games start, so she is not asking to go out through a house full of sleeping bodies later. Keep her normal bedtime feeding and settling order exactly as it is on quiet nights — familiarity is calming precisely because nothing about her routine has been negotiated away. If she becomes restless, one calm adult trip to her retreat with a toilet break beats a procession of sympathetic teenagers following her to see what is wrong.
Read how the first sleepover actually went
In the morning, notice specifics rather than deciding the whole idea was fine or awful. Did she eat breakfast at her usual pace, choose her retreat early or only late, and greet people willingly, or did she stick unusually close to you? A dog who paced, panted or stopped eating needs a bigger change next time — fewer guests, the retreat further from the noise, or a planned overnight with a familiar person instead. Keeping her retreat room, bedtime cues and what worked written down in KinsLe with Family Sharing lets every member of the household run the next sleepover the same settled way.