From your dog's point of view, the weekend visitor changes everything that matters: a strange dog sleeps in his house, eats in his kitchen, walks with his person, and curls up in the warm arc of attention that used to be entirely his. Pushing between you and the other dog, guarding the sofa, shadowing you from room to room, or going suddenly clingy are rarely spite. The fix is to make the visiting dog predict good, calm, structured things — and to make sure your dog's own life does not visibly shrink when the other dog walks in.
Structure the weekends before you soften them
Walk the dogs together on neutral ground before coming indoors, because dogs who have travelled side by side arrive home with much of the novelty already spent. Feed them in separate rooms or either side of a gate, sleep them apart, and lift the items that start arguments: favourite toys, long chews, and anything your dog has ever guarded go away for the weekend rather than being refereed. Keep both dogs' routines recognisably theirs — same walk times, same feeding order, same sleeping arrangements each visit — because predictability is what turns an intruder into a familiar guest over successive weekends. Use leads or light house lines indoors at first if greetings get pushy, and give each dog a bed or crate area that the other is never allowed to invade.
Protect your dog's place rather than compensating the guest
The natural human instinct is to fuss the visiting dog so he feels welcome and to tell your own dog not to be silly. Greet your dog as you always have, keep his one-to-one rituals — the morning ear rub, the evening game, his spot beside you — and let your partner do the primary settling of their own dog. When your dog pushes in between you, do not scold or shove him away, which confirms that the visitor costs him your goodwill; instead, calmly give both dogs something to do, such as settling on their own beds with a chew each, and reward your dog for choosing his place. Attention given for calm behaviour teaches far more than attention given for barging, which simply pays the behaviour you are trying to retire.
Read the difference between jealousy and genuine friction
Watch instead for the harder signals that mean the arrangement itself needs rethinking — stiffening over resting places, hard staring, snapping that escalates week to week, one dog unable to relax or eat, or either dog following the other with no ability to disengage. Those dogs need slower introductions, more separation, and possibly the visiting dog staying elsewhere while you build the relationship in shorter daytime visits. A dog who cannot settle at all is not being difficult for effect; he is telling you the weekends are more than he can currently handle, and pushing through tends to entrench the conflict rather than wear it out.
Let the pattern build over several weekends
Expect the first two or three sleepovers to be the most managed and the least relaxed; that is normal. Gradually, as the same sequence repeats — walk, feed apart, settle, sleep apart — most dogs downgrade the visitor from event to furniture. Resist relaxing every rule the first time things go well; drop management one piece at a time, such as shared toy time under supervision, while keeping separate feeding and sleeping arrangements for much longer, since those are the flashpoints that matter. KinsLe Family Sharing helps both partners keep the arrangement consistent, with each dog's feeding place, sleeping setup, trigger items, and settling routine shared between the two households, so a weekend at yours runs the same way every time instead of being renegotiated at the front door with two excited dogs.