A lot more than people think/know.
We were at the dog park a couple weeks ago and one of the regulars, a husky, got her head stuck in the entrance gate and started crying loudly. All of the dogs went over to check out the situation and mulled around her barking their heads off. It sounded like a dog fight.
My dog, Dani, went over, checked out the situation, and went to fetch the dog's owner who had already started to walk in that direction from the other side of the park. She has got to be among the smartest dogs at the park.
To stay cool, she will purposely lay in my shadow aligning her body to take best advantage of it and moving with it. And when asphalt is hot, she will move to the concrete gutter, then to the unpaved surfaces, accordingly.