Interesting replies. Maybe overheating was the better Term to have used.
In my mind your pooch is on back seat you pop to supermarket. Weather is overcast. You leave all windows,and roof if you have one, open 2 inches or so. Get held up for what ever reason and meanwhile a light shower comes along and all windows and roof close. Then the sun decides to split the sky and cabin heats up
Like an oven.
Plausible. ? In Scotland yes
California, Australia No but would anyone leave their beloved pet in a car in those climates.
Slight Tangent I have picked up expats who have flown in from Australia and New Zealand who have said they are escaping the summer weather as they just cannot cope with the heat. Can’t go out etc. Been there 30 years and now it’s a problem. I wonder if the folk born there feel the same ?
In Scotland we can have four seasons in one day. no joke. Sun in Morn snow in afternoon.
Ps I’d never leave my dogs in car for any reason. And not just because scumbags are now stealing them.