In Boston in the early 80s the power went out off and on all summer - the grid just couldn’t handle the load of all those AC units running, I guess. (Maybe it still does, I don’t know.) At the vet hospital we had a generator that could still run some lights and critical machinery, but our AC wasn’t cooling much, either. We always had an uptick in heat exhaustion/heat stroke dogs during summer power outages, sometimes more than we had places for. The protocols then were a little different from the video, but it was still basically cool water, ice packs and fluids to try and save the dogs. I remember big dogs going into whole ice baths, then, in a desperate effort to cool them enough to get them through it.
We didn’t always manage to save them. Heading to the vet at the first sign of distress is critical.