From our house · Tokyo

Summer heat and flat-faced dogs: how our house does it.

Gunso is a French Bulldog. Ponsuke is a Boston Terrier. Both have the short nose that makes them very good at looking offended and very bad at cooling down. This is what a Tokyo summer looks like in our house — not veterinary advice, just the routine that has kept two flat faces comfortable for years. Your vet knows your dog; we only know ours.

Last updated 3 September 2026 · 5 minute read

Gunso the black brindle French Bulldog squinting in bright sun
Gunso, black brindle, absorbs sunlight like a small asphalt roof. This is relevant.

Why flat faces and heat do not mix

Dogs cool themselves mostly by panting. A short-nosed dog has less airway to pant through, so the same heat that a Labrador shrugs off becomes real work for a Frenchie or a Boston. Add a dark coat — Gunso's brindle is basically black — and the dog is heating up faster and cooling down slower at the same time.

When we walk

  • Before sunrise or after sunset. In July and August that means out the door around 5 a.m., or after 7:30 p.m. Midday does not happen.
  • The back-of-hand test. Hand flat on the pavement for five seconds. If it is uncomfortable for us, it is burning their paws. We turn around.
  • Short and slow. Twenty minutes of sniffing beats forty minutes of marching. Gunso decides the pace; he is nearly nine and has earned it.
  • Harness, not collar. Nothing around the throat of a dog who already breathes through a straw.

What we carry

  • Water, more than seems reasonable, and a folding bowl.
  • A small towel we can wet and lay over the belly and paws if someone starts to look hot. Cool water, not ice water — sudden cold is its own problem.
  • The phone, with the vet's number already in favourites.

The signs that mean stop, now

Frenchies and Bostons snort and huff as a lifestyle, so the trick is knowing what is not normal for your dog. In our house, any of these ends the walk and starts cooling:

  • Panting that is loud, fast, and does not settle after a minute in the shade.
  • Thick, ropey drool.
  • Gums that look very red — or very pale.
  • Wobbly walking, sitting down and refusing to move, glassy eyes.
  • Vomiting or diarrhoea in the heat.
What we do: shade or air conditioning immediately, cool water on the belly, paws and neck, small sips to drink, and we call the vet while doing it — not after.

Heatstroke in a flat-faced dog can go from "he looks a bit hot" to an emergency faster than people expect. We would rather make an unnecessary phone call than a necessary one too late.

Indoors

  • The air conditioning stays on. We keep it around 26°C and the dogs choose their own spot — Ponsuke on the cooling mat, Gunso on the bare floor by the door, with great dignity.
  • Water in more than one room. Flat-faced dogs drink in short, messy bursts and give up if the bowl is far.
  • Munch the Bengal drinks only from the fountain and only when watched. Cats hide heat stress well, so on hot days we count how often he drinks.

The one rule we never break

Nobody waits in the car. Not for a minute, not with the window cracked, not in the shade. A parked car in a Japanese summer is an oven with seats, and a flat-faced dog has no margin. If the dogs cannot come in with us, they stay home with the air conditioning.

Ponsuke the Boston Terrier looking directly at the camera
Ponsuke, who has read this article and would like it noted that he is fine.

If you have a flat-faced dog and a hot summer, we hope one line here is useful. And if your vet tells you something different from what we do — listen to your vet. They have met your dog. We have only met ours, and one of them is currently asleep on the cooling mat with his tongue out.

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