Start before the moving boxes arrive
A merged household asks a lot of both dogs at once: a new address, a new canine housemate, new smells on every cushion, and two sets of humans who have previously run things differently. Begin the work before either home is packed up. Let the dogs meet outdoors on neutral ground, walk them in parallel at a comfortable distance, and repeat those walks until their body language is loose and bored rather than fixed and intense. If those meetings go well, short visits to the new home together, ending before either dog gets tired or possessive, teach them that the other dog belongs in that space too.
Agree one set of house rules as a couple
Dogs notice inconsistency faster than people do. One household may have allowed sofa time, begging at the table and free access to the garden, while the other kept dogs off furniture, fed in a crate and used a lead outside. Neither set is automatically wrong, but running both at once invites conflict, because a dog corrected by one person for behaviour another person rewards will become anxious and pushy. Sit down and settle the combined rules in plain terms: where each dog sleeps, whether furniture is shared, where meals happen, who lets dogs out first thing, and how greetings at the front door are handled. Write those decisions where both of you will actually see them during the busy first weeks.
Protect food, beds and favourite spots at first
Resources are where newly merged dogs most often fall out, even dogs who walked happily together outside. Feed them apart, with a door or gate between them, and lift bowls as soon as each dog finishes so nobody wanders over to investigate the other's dish. Give each dog a bed that is unmistakably theirs, placed where they can rest without being stepped over by the housemate, and keep high-value chews and treasured toys out of shared areas until you have watched many relaxed interactions. Double up on the basics rather than forcing sharing: separate leads, separate water stations on different sides of the room, and enough resting spots that neither dog has to negotiate for a place to lie down.
Build the shared daily rhythm one piece at a time
Choose a single timetable for the combined home instead of alternating between the two old ones. Walk together if both dogs are comfortable at the same pace, or walk separately at first if ages, fitness or reactivity differ, but keep meal times, garden breaks and bedtime consistent from day one. Keep the first fortnight deliberately dull: predictable routes, familiar food for both dogs, and no housewarming gatherings crowding the dogs' new territory. Add shared pleasures gradually, such as training games side by side with distance between handlers, then closer as their focus on you outweighs their interest in each other.
Watch the quiet signals in the first weeks
Most friction shows up quietly before it becomes an argument: a dog who stops entering a room, guards a doorway with a hard stare, eats faster than usual, or starts sleeping pressed against a particular person. Note which resource or moment was involved and increase separation around it rather than testing whether it happens again. If either dog cannot relax in the other's presence after a careful introduction period, bring in a qualified behaviour professional for an outside view of the household dynamics. KinsLe Family Sharing lets owners grant chosen family members access to those profiles.