Same pattern every June: temperatures climb, Zurich turns into an urban heat island, and vets in Winterthur and Uster suddenly see more heatstroke cases than during the rest of the year combined. That is not a coincidence. Dogs and cats regulate their body temperature very differently from humans, and most owners underestimate how fast an ordinary walk turns into a medical emergency.
Why heat is more dangerous for dogs than for us
Humans sweat across most of their skin. Dogs do not. They cool down almost entirely through panting, with a small assist from their paw pads. That works fine at moderate temperatures, but once it climbs past roughly 25 degrees with high humidity, the mechanism often cannot keep up. Flat-faced breeds such as pugs, French bulldogs, and boxers are hit hardest. Their narrowed airways make efficient panting nearly impossible, which is exactly why these breeds show up most often at Zurich veterinary clinics with heatstroke during summer.
Older dogs, puppies, and overweight dogs also carry higher risk. Their cardiovascular systems already run close to their limit, and heat is often the factor that tips things over.
Recognizing heatstroke: the symptoms that matter
Heavy, labored panting that does not let up. Dark red gums. Saliva turning thick. Unsteady gait, vomiting, and in severe cases collapse. If you see any of these signs, act immediately, there is no room for waiting to see if it passes. Move the dog into shade, wet them with lukewarm water, not ice cold, focusing on the belly and paws, and drive straight to the nearest vet. Ice water sounds logical but actually constricts blood vessels and slows internal cooling. It is a common mistake.
Asphalt: the underrated enemy
In Zurich, Oerlikon, or along the major arterial roads, asphalt can exceed 50 degrees when air temperature sits at 30. The simple test: press your palm to the ground for five seconds. If it is too hot for you, it is too hot for your dog's paws. Burns on the pads are painful, heal slowly, and owners often only notice once the dog starts limping. Walking on grass, in the forest, or along the Limmat is clearly the better choice on such days than city sidewalks.
Choosing the right time of day
Early morning, before seven, or late evening, after nine. Everything in between during summer is a window where a walk does more harm than good. The forested paths on the Uetliberg stay tolerable even at midday, but open ground should be avoided entirely during peak heat. If a midday walk is unavoidable, keep it to a few minutes and stick to shaded routes.
Cars, balconies, closed rooms: the most common death traps
A car parked in the sun reaches temperatures inside that can kill a dog within ten minutes, even with a window cracked open. There is no exception, no quick errand that justifies it. Just as underestimated: balconies without shade and poorly ventilated top-floor apartments. Anyone living in a rooftop flat in Zurich already knows the problem in summer. For a dog it matters even more, since they cannot simply leave to escape the heat the way we can.
Cats: the quiet danger
Cats show heat stress less often and less obviously than dogs. An animal lying flat, barely moving, breathing fast, is already in distress. Outdoor cats usually find their own shaded, cool spots in summer, but indoor-only cats depend entirely on the environment you provide. Fresh water in several locations, a cool patch of floor, no direct afternoon sun through the window. In most cases, that is enough.
Practical measures for everyday life
Always carry water, even for short outings. Cooling mats at home are a worthwhile investment, especially for flat-faced breeds and senior dogs. Do not shave the coat completely, many breeds use their fur as insulation against heat, and a full shave can do more harm than good. For double coats, brushing out the undercoat is usually sufficient. If in doubt, ask a local dog groomer or vet before reaching for the clippers.
Summer holidays and heatwaves tend to overlap, and that is exactly when many dogs need care from someone who knows what to watch for. Not every house sitter or neighbor recognizes the warning signs of heatstroke or knows how to plan a walk at 32 degrees.
If you need reliable care for the next hot spell, do not wait until the last minute. Gelbe Pfoten connects you with vetted pet sitters across Canton Zurich who understand the risks of Swiss summers.
Need reliable care for your pet during the next heatwave?
