Bringing a second dog home is exciting, and it is also the moment most multi-dog households are made or broken. The first meeting matters, and so does the fortnight after it.
Never do this
Do not walk the new dog through your front door and let the resident dog meet them in the hallway.
Your existing dog is being asked to accept a stranger in the middle of their own territory, in a narrow space with no escape route, while everyone hovers anxiously. It is the worst possible setup, and it is what most people do.
The neutral territory walk
The best introduction is not really a meeting at all. It is a walk.
**You need two handlers**, one per dog, with the dogs on ordinary lead and harness. Not retractable leads, which tangle at exactly the wrong moment.
- **Meet in a neutral place** — a quiet park, a field, a side street. Somewhere neither dog considers theirs
- **Start twenty or thirty metres apart** and simply walk in the same direction, parallel
- **Keep leads loose.** Tension travels straight down the lead and tells both dogs something is wrong. This is the single biggest handler error
- **Gradually close the gap** over ten or fifteen minutes, only as fast as both dogs stay relaxed
- **Let them sniff the ground where the other has been.** Scent does most of the introduction work
- **Allow a brief side-by-side sniff** — three seconds, then walk on cheerfully
- **Keep walking together** for another twenty minutes
Short repeated greetings beat one long one. Face-to-face, head-on greetings are rude in dog terms and are where most tension starts. Curving, side-by-side, brief: that is polite.
Reading the dogs
**Good signs:** loose wiggly bodies, curved approaches, play bows, sniffing the ground, shaking off, looking away, relaxed open mouths.
**Warning signs:** stiff still bodies, a high tight tail wagging fast and small, hard staring, standing over the other dog’s shoulders, freezing, raised hackles with a stiff posture, lip lifting, a low growl.
**Immediate separation signs:** frozen stillness, a hard stare that will not break, or either dog trying persistently to leave.
A growl is useful information — it means a dog is uncomfortable and is telling you politely. Increase distance, do not punish it.
Coming home
Once the walk has gone well:
- **Walk both dogs to the house together** and go in at the same time, or let the new dog in first while the resident dog is still outside finishing the walk
- **Pick up everything first** — toys, chews, food bowls, beds in doorways. Remove every reason to argue
- **Let them separate.** Do not keep them together to “bond”. Dogs need the option to walk away
- **Keep the first few hours boring.** No visitors, no games, no excitement
The first two weeks
This is where the relationship is actually built, and the rule is simple: **supervise or separate.**
- **Feed in separate rooms**, with a door between them, every meal
- **No chews or high-value items** when they are together, for at least two weeks
- **Separate them when you go out** — crates, baby gates or separate rooms
- **Give each dog time alone with you**, including individual walks. This matters more than people expect
- **Do not let the new dog pester the resident dog.** If the older dog moves away, that choice must be respected. This is the single most common cause of a resident dog becoming grumpy
- **Interrupt play before it escalates.** Short breaks keep arousal manageable
Many households find the first fortnight is polite rather than friendly, and the real friendship arrives in month two or three. That is normal.
Puppy meeting adult dog
Adults are usually tolerant of puppies, but their tolerance is finite and the puppy has no manners.
Protect the adult dog. Give them a puppy-free zone, behind a gate, that the puppy can never access. An adult who is never allowed to escape a pestering puppy will eventually snap — and a well-timed telling-off from an adult dog is normal communication, not aggression, so long as it is proportionate and the puppy backs off.
Same-sex pairings
The uncomfortable truth: serious, sustained inter-dog aggression within a household is more common between two females than any other combination, and once established it can be very hard to resolve.
This is not a reason never to have two bitches. It is a reason to be thoughtful about temperament matching, to take introductions slowly, and to get professional help at the first sign of real tension rather than the fifth.
If it goes wrong
Separate calmly — do not reach between two dogs with your hands. Use a barrier, a chair, a lead, or a blanket thrown over them.
Then step back and get help from a qualified behaviourist before trying again. Repeated bad encounters make the relationship worse each time; three failed introductions are much harder to undo than one.
Realistic expectations
Not every pair of dogs becomes best friends, and that is fine. Plenty of multi-dog households run happily on polite coexistence: they share a house, they walk together, they sleep in the same room, and they do not particularly play.
A calm truce is a successful outcome.
