We all know that it is not safe to leave a child in a car in hot weather, but many don’t realize that it is far more dangerous for a dog or a cat than for a human. A human can sweat, which helps cool the body. A dog has only a few sweat glands in the pads of his feet. He keeps cool in hot weather by panting. When your dog pants, he inhales fresh air through his nose. The nose contains a maze of moist surfaces that are cooled by evaporation. If the dog is in a hot car, the air he breathes in is not cool enough to do him much good.