One Door, Several Dogs: Dog Doors for Multi-Dog Households

One dog, one door is simple. Two or three dogs of different sizes — a Labrador, a Beagle and a Shih Tzu sharing one garden door — raises questions a single-dog home never faces: whose size wins, can the small dog push the big dog’s flap, and will they queue, barge or guard the doorway? A dog door for multiple dogs has to answer all of those. Our guide to dog doors for multi-dog households starts from the same three sizes we fit everywhere, but the way they combine in a shared home is its own subject, and it is the subject of this article.

The first rule: size for the largest dog

A shared door must fit the biggest dog in the house, full stop. Our sizes are Medium at 23×35 cm (Bulldog, Shih Tzu, Poodle), Large at 28×45 cm (Beagle, Pointer) and X-Large at 36×65 cm (Labrador, Golden Retriever, Husky, Great Dane). If the largest dog needs an XL opening, the household door is an XL — a big dog cannot use a smaller dog’s door even occasionally, whereas a smaller dog can almost always use a bigger dog’s door with a little practice.

Measure the biggest dog properly before deciding: shoulder height against a wall, and the widest point of the chest or shoulders. If that dog is near the top of one size, go up a size, because the door has to serve it confidently for years, including when it is older and stiffer than it is today.

The second question: can the smallest dog work the big flap?

This is the genuine trade-off in a shared-door home. A bigger flap is a heavier flap, and the magnetic seal that keeps it shut against the heat is also resistance a small dog has to push against. In practice, most small dogs manage a Large flap without trouble, and many manage an XL once they learn to push with their chest rather than their nose — the technique we encourage during training, because a chest push uses the dog’s strength instead of its face.

Where a shared door struggles is the extreme pairing: a Great Dane’s XL flap and a very small or elderly toy breed. If the smallest dog cannot shift the big flap after a fair training period, the answer is not a smaller shared door — the big dog still needs its XL — but a second, smaller door of its own, usually in a different panel or door, sized Medium with a low step-over it can manage. Two doors also suit homes where the dogs use different areas: a garden door for the big dogs and a utility or side door for the small one.

Traffic: how dogs actually share a door

Owners imagine a queue; dogs organise something looser. Expect these patterns in the first weeks:

• Following the leader. A confident dog goes first and the others copy it. Train the boldest dog first and let the nervous ones watch — a demonstrating dog teaches more in an afternoon than treats alone do.
• The doorway stand-off. Two dogs arriving from opposite sides at once will usually negotiate with a pause and a sidestep. A wider opening helps here, which is another reason to size up at boundaries: a 36 cm-wide XL opening lets a smaller dog slip past a hesitant bigger one.
• Guarding. Occasionally a dog decides the new door is its possession and camps beside it. This is a training matter, not a sizing one — feeding and resting spots away from the doorway, and short shared practice sessions, settle it in most homes.

Flap traffic also means flap wear. A door used by three dogs works three times as hard, so the seal and flap condition are worth a glance every few months; a magnetic seal that still pulls the flap firmly shut is what keeps cooled air in a busy house.

A practical plan for fitting a dog door for multiple dogs

• List every dog’s measurements — shoulder height and widest width for each, not just the largest, so the smallest dog’s needs are on the table too.
• Decide one door or two based on the size gap: one shared door for most households, two where the smallest dog is tiny, elderly or frail.
• Choose the panel for the traffic. The main garden door takes the traffic best; in glass, the flap sits in a made-to-measure replacement panel, and your original glass is stored and swapped back in 30 minutes at move-out — 100% rental-friendly, no landlord NOC.
• Sliding door? A track insert in the standard white frame and clear glass can be fitted the same day if booked before 10 AM, with custom RAL powder-coated finishes in 2–3 days.

For dogs we fit Hakuna Pets and PetSafe doors, whose magnetic seals suit high-traffic homes: the flap latches shut after every pass, whichever dog made it.

Frequently asked questions

Should each dog have its own door?

Usually not. One door sized for the largest dog serves most multi-dog homes well, and dogs prefer a shared, familiar route. A second door earns its place when the smallest dog genuinely cannot push the biggest dog’s flap, or when the dogs live in different parts of the home.

My big dog is fine, but my small dog is scared of the XL flap. What helps?

Train the small dog separately, with the flap held fully open at first so it learns the route without any push, then lower it in stages as confidence grows. Reward the chest push, not the nose push. Most small dogs master a big flap within days once the route itself feels safe.

Do dogs teach each other to use the door?

Yes — it is one of the advantages of a multi-dog home. A confident dog demonstrating the door is the fastest teacher a nervous dog can have, which is why we suggest training the boldest dog first and letting the others watch from nearby.

Which size if I have a Beagle and a Labrador?

X-Large. The Labrador needs the 36×65 cm opening, and the Beagle will use the same door without difficulty once shown. Sizing the shared door to the Beagle’s Large would leave the Labrador ducking and twisting on every pass.

Can the dogs still be kept in at night with one shared door?

Yes. The doors we fit can be closed off with a locking panel that slides in over the flap, so the whole household is in for the night with one action — and the same panel secures the door when the house is empty.

One door that works for every dog

WhatsApp us on +971 52 443 2655 with each dog’s breed and measurements and a photo of the door or panel, and we will work out whether a dog door for multiple dogs means one shared door or two in your home. You can also email admin@petdoorfix.com. We fit dog doors across all seven UAE emirates.

Next guide: Puppy’s First Dog Door: Sizing for the Dog Yours Will Become