Start with the toilet spot and one room
Before your dog crosses the threshold, take him to the exact outdoor spot you want him to use, let him sniff and relieve himself there, and praise him warmly, because the first success sets the pattern for housetraining in the new place. Then bring him into a single prepared room with his bed, water bowl, and something carrying a familiar smell, such as his previous blanket or a worn item of your clothing if he knows you. Let him investigate that room fully, off lead, at his own pace, and resist the urge to give the grand tour immediately; a whole strange house, room after echoing room, overwhelms many dogs on day one.
Let exploration happen at his speed
Once he is relaxed in the base room, open the house gradually, walking him through on a loose lead if he is keen, or in short sessions if he is hesitant, and let him sniff properly rather than pulling him along. Show him where his water lives, where the garden door is, and where he will sleep, then return to base. Puppies, rescue dogs, and dogs who have moved from a kennel environment may need the staged version over the whole first day, while a confident dog rehoming with his own family often surveys the house within the hour and chooses his spot. Both speeds are normal.
Borrow stability from his old routine
Feed what he is used to eating, at his usual times, even if you plan to change his food later, because an upset stomach on top of a strange house helps nobody. Keep the day's shape familiar: walk, rest, play, and toilet breaks in roughly his old order, with visitors postponed until tomorrow and household excitement kept low. If children are desperate to meet him, make it one calm introduction in his base room, seated, letting him approach. A dog whose previous owner shared his routines, fears, favourite foods, and comforts gives you a first day built on knowledge instead of guesswork.
Handle the first night gently
Many dogs who were brave all day wobble at bedtime, when the house goes dark and quiet. Let him sleep in his bed near you for the first night or two, even if the long-term plan is a different room, and move him to the permanent spot gradually once the house smells familiar. Expect a toilet trip in the night, keep it boring and brief, and do not interpret whining on night one as a permanent behaviour problem. If his profile reached you through KinsLe Transferrable Profiles, his history, records, and routines came with him intact, so the details that made his first day calm, from his evening feed time to the blanket he sleeps with, are already in your hands in KinsLe.