 Cats are a little different. The first thing and often the only thing you see is open mouth breathing. And for a cat, that is an emergency. So you need to take them to the vet right away. Again, when in doubt, give your vet a call or take them in. I'm also thinking that some of the tips for humans must apply to pets. If I'm going outdoors, I'm going for a run or something in this weather, I'm looking for a shady path. I'm trying to stay out of the direct sunlight.