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The first hot week of the year, my building’s heat was still technically on and the flat sat at 84 degrees. The dog stopped using her bed entirely and moved to the bathroom tile, where she stayed for four days. She was right and the bed was wrong, and that is most of what you need to know about keeping a dog cool indoors: the dog will find the coolest surface in the apartment on its own, and your job is mostly to make sure a good one exists.
Air conditioning solves this. Plenty of city apartments do not have it, mine included, and the advice that follows assumes you are working with a fan, a window and whatever you can freeze.
Dogs do not cool the way you do
You have sweat glands over your whole body, so a fan works on you because it evaporates the moisture on your skin. A dog has sweat glands only in the paw pads, which is a rounding error. Almost all of its heat leaves through panting: air moves across the wet surfaces of the tongue, mouth and upper airway, and the evaporation carries heat away.
That has two consequences people get wrong. A fan blowing on a dry dog does much less than it does on you, because there is nothing to evaporate. And panting stops working when the air is both hot and humid, which is why a muggy 86-degree day is far more dangerous than a dry 95-degree one in Phoenix.
The fix for the first problem is cheap. Wet a towel, wring it out so it is damp rather than dripping, lay it flat on the floor and point the fan across it. The dog lies on a damp surface with air moving over it, which is evaporative cooling actually working. Do not drape a wet towel over the dog’s back. A wet towel on top of a dog traps heat against the body once it warms, which is the opposite of the intent, and it is a genuinely common mistake.
Cooling mats, honestly
Three products get sold under one name and they behave differently.
Pressure-activated gel mats are the ones you see everywhere. The gel is cool because it sits at room temperature and room temperature is below body temperature, so the dog feels relief for the first fifteen to thirty minutes. Then the gel reaches equilibrium with the dog and it is just a mat. It recovers in about twenty minutes off the dog, which is fine if the dog moves on and off, and useless if you expected an hour of cold. They are also the ones a chewer will puncture. The gel in most is labeled non-toxic, which still means vomiting and diarrhea in any quantity, so never leave one in a crate with a dog that chews bedding.
Water-fill mats are the same idea with more thermal mass and more weight. They stay cool a little longer and leak more spectacularly.
The one I would buy is not a mat at all. An elevated mesh cot works by airflow rather than by absorbing heat, so it never runs out. The dog sits four inches off the floor on a taut breathable surface with air moving all the way around it, and in a hot flat with a fan pointed at floor level it beats every gel mat I have used. It is also the only option here that does not eventually equalize.
And the free version stays undefeated. Tile in the bathroom or kitchen conducts heat out of a dog faster than any product, which is why dogs sprawl on it. If your flat is all wood and carpet, a large ceramic tile from a hardware store laid in a shaded corner costs about eight dollars and works.
Freeze things
A hollow rubber toy packed with wet food or plain yogurt and frozen overnight does two jobs at once. It drops core temperature a little, and it occupies a dog that cannot go out for a proper walk in the afternoon. In July and August the second part matters more than people expect, because a bored dog in a hot flat is a barking dog, and indoor enrichment is what replaces the walk you skipped.
Ice cubes in the water bowl are fine. The claim that cold water causes bloat has circulated for years on the strength of one anecdotal case and there is no evidence behind it. What does contribute to bloat is a dog gulping a large volume of anything at once right after exercise, cold or not, so the sensible rule is smaller amounts more often rather than avoiding ice.
Freeze a water bottle, wrap it in a thin dish towel, and put it at one end of the dog’s sleeping spot. The dog regulates by moving closer or further away, which is more useful than any device trying to hold a fixed temperature.
Walk timing, and the seven-second test
Asphalt at 77 degrees of air temperature reaches about 125 degrees in direct sun. At 87 degrees air it passes 140, which burns paw pads in under a minute. The test is the back of your hand pressed flat to the pavement for seven seconds. If you want to lift it, the walk is not happening.
In practice that means walks before 8 a.m. and after sunset in high summer, with midday trips cut down to a relief break on grass or in shade. Dogs cope with this far better than owners fear, provided the missing exercise gets replaced indoors with something that uses the nose and the brain.
The dogs that cannot wait for you to notice
Flat-faced breeds, meaning French bulldogs, pugs, English bulldogs, Boston terriers and Pekingese, carry the same volume of soft tissue as a long-nosed dog inside a much shorter skull. The airway is narrowed along its whole length, so the panting that is supposed to cool them is itself hard work that generates heat. They overheat at temperatures where a Labrador is merely uncomfortable, and they do it fast.
Same caution for puppies, dogs over about nine, overweight dogs, and any dog with a heart or airway condition. If your dog is on that list, treat 79 degrees indoors as the point where you actively intervene rather than the point where you start thinking about it.
Double-coated breeds are the opposite case and get mishandled constantly. The undercoat insulates against heat as well as cold, and shaving it removes the guard coat that reflects sun and blocks UV, leaving a dog that gets hotter and sunburns. What you want is that undercoat physically removed by brushing, which means ten minutes a day with an undercoat rake in June and does more for summer comfort than any gadget on this page.
Heatstroke, and the twenty minutes that matter
Normal canine body temperature runs 101 to 102.5 degrees Fahrenheit. Heatstroke starts around 104 and organ damage begins near 106.
What you are watching for: panting that has turned frantic and noisy, thick ropey drool, brick-red or very pale gums, wobbling in the back legs, vomiting or diarrhea, a blank stare. A dog that has been panting hard and suddenly stops panting is an emergency, not a dog that has calmed down.
What to do: get it out of the heat, wet the belly, groin, armpits and paws with cool tap water, and move air over it with a fan or an open car window. Not ice water and not an ice bath, because extreme cold constricts the surface blood vessels and slows the heat loss you are trying to cause. Then drive to the vet with the cooling continuing in the car. Internal damage from heatstroke shows up hours later, so a dog that looks recovered still needs to be seen.
The boring things that work best
Close the curtains on the sunny side in the morning, before the room heats up, rather than after. Open windows at both ends of the apartment overnight and shut everything by 9 a.m. Put water in more than one room, because a hot dog that is comfortable will not always get up and cross the flat for it. And leave the bathroom door open, since it is usually the coolest room and usually the one people close.
If your dog abandons its bed in July, that is not a problem with the bed. Give it a tile, a cot and a fan, and let it choose. The bed matters again in October, by which point a summer of drool and paw dirt has left it needing a wash anyway.
Frequently asked questions
Does a fan actually cool a dog down?
Much less than it cools you. You sweat over your whole body, so moving air evaporates that moisture; a dog only has sweat glands in its paw pads. A fan works on a dog when there is something to evaporate, so lay a damp towel flat on the floor and point the fan across it rather than aiming it at a dry dog.
Do cooling mats for dogs work?
Gel mats work for fifteen to thirty minutes, then reach equilibrium with the dog and become an ordinary mat. They recover in about twenty minutes off the dog. An elevated mesh cot cools by airflow instead of by absorbing heat, so it never runs out, and in a hot apartment with a fan at floor level it outperforms every gel mat. Bathroom tile costs nothing and beats both.
At what temperature is pavement too hot for a dog?
Asphalt reaches about 125 degrees when the air is 77, and passes 140 when the air is 87, which burns paw pads in under a minute. The working test is the back of your hand pressed flat to the pavement for seven seconds. If you want to lift it, walk before 8 a.m. or after sunset instead.
What are the signs of heatstroke in a dog?
Frantic noisy panting, thick ropey drool, brick-red or very pale gums, wobbling back legs, vomiting, a blank stare. A dog that was panting hard and suddenly stops is an emergency. Wet the belly, groin and armpits with cool tap water, move air over it, and drive to the vet with the cooling continuing. Not ice water, which constricts surface vessels and slows heat loss.