The risk in this introduction is not really the newcomer; it is what the resident dog believes he is losing. A dog who has ruled the sofa for years reads the house as a set of understood privileges: that cushion is his, that bed is his, your lap in the evening is his. A second dog settles fastest when those privileges are renegotiated gradually and visibly fairly, instead of vanishing the day a stranger walks in with a new lead.
Before the arrival, walk the house as your older dog experiences it and list the resources that matter to him. Owners usually name food, yet the sofa spot, a favourite bed, particular toys, long-lasting chews, and first claim on greetings and lap time often rank higher. That resource map becomes your management plan for the opening weeks.
Neutral Ground and Parallel Walks First
Arrange the first meeting on neutral ground neither dog owns, such as a quiet street or open park space, with one handler per dog. Begin with a parallel walk: same direction, enough distance apart that both dogs can notice each other and still walk loosely, sniff the ground, and take treats. Let the distance shrink across the walk only while both bodies stay soft.
Brief sniffs can come after the walking has taken the edge off, followed by walking on together rather than a face-to-face standoff. Repeat with another walk on a different day if the first felt tense. A garden or hallway first meeting forces the resident dog to defend his map and the new dog to enter it, which is precisely the framing you want to avoid.
Renegotiating the Sofa and Other Privileges Gradually
Do not announce a new order by pushing the resident dog off the sofa so the newcomer can take a turn. Instead, add capacity and choice: a second good bed placed near the sofa, settled time for the new dog coached onto that bed with rewards, and invitations for the older dog onto the sofa that continue as before. Over weeks, as the dogs relax around each other, shared furniture time can be supervised and brief, with either dog free to leave.
Pick up high-value chews and prized toys for the early period, and give long-lasting chews only when the dogs are separated. Feed separately from day one, behind a door or gate, and lift both bowls when meals end so food never becomes a roaming dispute. Keep greetings low-key as well, since the doorway scrum over who reaches you first is a common flashpoint in otherwise peaceful pairs.
Supervised-Only Early Weeks
For the first weeks, the dogs are together only when an adult is actively present, and separated whenever the house is empty or everyone is asleep. Use gates, crates the dogs already accept, or closed doors, and make separation feel normal rather than punitive by feeding and settling each dog in their own space as part of the daily rhythm.
Protect the resident dog's one-to-one time deliberately: his usual walk, his usual game, and his usual evening spot beside you should survive intact, with the newcomer getting separate bonding time of their own. Watch for quieter warning signs across these weeks, such as the older dog leaving rooms he used to own, guarding doorways, or shadowing you constantly, and slow the merging down if they appear. Sharing feeding places, walking arrangements, and which privileges are being adjusted, through KinsLe's Family Sharing, means a partner or dog walker applies the same gradual plan instead of accidentally staging a sofa contest.