Granted, it was 114 at the time (!!!!) but still... (Yesterday was the hottest day of the year, so far. We had heat warnings, etc. I'm hoping that, while still hot, the rest of the week will be cooler that yesterday.)
He'd only been out a short time with Dh. Long enough for a constitutional, and for Dh to check the chickens' mister. In other words, not long at all.
When they came in, he was clearly over-heated. So we wet his inner thighs, stomach, arm pit areas, head/ears, etc. with cool, wet, towels.
Because he wasn't suffering actual heatstroke, he was just beginning to overheat, he was fine after a short while, but it's definitely not something to trifle with.
With this type of heat, you have to be so careful. Don't let your dogs stay outside for long during the hottest part of the day; don't let them play when it's hot...play in the mornings, and after it cools down; and keep an eye on them...just in case.
I know that I posted this recently, but here it is again:
Heatstroke in Dogs
You'll be able to find symptoms, etc. there.
Keep cool, and keep an eye on yourself, and your critters.
Love All Life, Thank You For Posting! :)