Hot Ground, Hot Dog — Ottawa's First Heat Wave of 2026
- Jon Wells
- Jun 28
- 4 min read
Ivy has the right idea. (Photo: Janet Langdon)
Ottawa is in it now.
Environment Canada has issued an extended heat alert covering the entire week. Monday and Tuesday hit 29°C with a humidex of 35. Wednesday July 1st climbs to 31°C. Thursday and Friday land at 34°C — with a humidex pushing 42°C. Overnight lows sit at 19, 21, and 22°C through the stretch.
That last number matters more than most people realize. We'll come back to it.
You Feel 35°C. Your Dog Feels 57°C.
When Canadians invented the humidex, the idea was simple: the number on the thermometer isn't the whole story. Humidity changes how your body handles heat. What feels like 29°C is actually 35°C on your skin.
Your dog has the same problem — and then some.
Because your dog isn't walking in the air. They're walking on the ground.
Look at the 29°C column in the chart below. The air feels like 35°C to you. Your dog's paws on grass? 36°C — manageable. Your dog's paws on asphalt? 57°C. That is ten degrees past the burn threshold. Paw tissue begins to break down in 60 seconds at 52°C.
Now look at Thursday and Friday. Air temp 34°C. Humidex 42°C. Asphalt surface temperature: 65°C.
That's not hot. That's a cooking surface.
The Surface Makes All the Difference
Not all ground is equal. Here's what this week looks like under your dog's feet:
Black road asphalt — the worst. Absorbs heat all day, holds it like a battery. At 34°C air temp it reaches 65°C. Dark colour, dense structure — it was engineered to retain heat. It does its job extremely well.
White sidewalk concrete — dangerous, not safe. Lighter colour absorbs slightly less. Still hits 55–58°C this week. The white sidewalk feels safer. It isn't.
Natural grass in shade — the winner. Stays around 35–42°C even on the hottest days this week. Still warm, but below the burn line. This is where your dog walks this week.
Artificial turf — don't be fooled. Heats almost as badly as asphalt, especially when laid over concrete. The green stuff at the dog park is not the same as natural turf.
Check it with your hand before you let your dog loose on it.
Here's the Part Nobody Talks About
Ottawa's overnight lows this week are 19°C, 21°C, 22°C.
Asphalt needs cool overnight temperatures to shed the heat it absorbed during the day. At those overnight lows, it can't do it. Pavement that hit 65°C at 3pm on Thursday will still be above 52°C — the burn threshold — at 9pm. It may still be dangerous at 7am Friday before the sun has even warmed the air again.
There is no safe window on Thursday and Friday unless you are on grass.
This isn't typical Ottawa summer heat where an early morning walk solves the problem. This week, the seven-second test isn't optional — it's mandatory, every single time, no matter the hour.
The seven-second test: place the back of your hand flat on the pavement. If you can't hold it there for seven full seconds, your dog doesn't walk on it.
Best Advice
This is what we'd tell every client if we could call them all today:
Walk before 7am or after 9pm, on grass only. Not pavement, not the sidewalk to get to the park. On grass. Plan your route before you leave.
Shorten the walk. Lengthen the sniff. A 15-minute sniff in the shade does more for your dog's brain than a 45-minute march. Olfactory work is genuinely tiring. Use it.
Water before, during, and after. Don't wait for panting. Offer it constantly. By the time they look thirsty, they're already behind.
Skip it if you can. If the outing isn't necessary, don't do it. Rest is a valid choice this week.
Real World Advice
We know you have a dog with a bladder. We know life doesn't pause for heat advisories.
If you have to go out mid-day:
Grass verge only — even a narrow strip between sidewalk and road is better than asphalt
Keep it to 10 minutes maximum
Bring water and pour some on their paws when you get back
Watch their paws after — licking, lifting, or limping means stop and check immediately
If you see blistering or raw skin, that's a vet call, not a wait-and-see
One More Thing
Ivy, the dog at the top of this post, is already ahead of all of us.
Creek. River. Pool. Hose. Paddling pool in the backyard. Whatever version of that you can give your dog this week — do it. Early morning or evening, on natural ground, in the water.
A soaking wet dog who just waded in a stream has cooled their core, burned real energy, and had the best 20 minutes of their week.
Find your dog's version of that.
BetterDog is Ottawa–Gatineau's consent-based in-home dog training team. We work with dogs as they actually are — not as we wish they were. Questions about your dog's behaviour during summer stress? Book an intro session at betterdog.ca.
Share this with someone who walks their dog at noon.
