We live in central Florida and the heat can be brutal here, especially in the summer months. My pets are all indoor animals so they rarely go outdoor anyway but in the heat especially they stay inside. We of course, let them out to go to the bathroom and we take them for short walks but that is the extent of it. If they are out for more than 5 or 10 minutes they get over heated and pant like crazy.
They love to go for walks but we have to limit the time they walk to about 10 minutes max. Both of our dogs know when they have had enough and usually will turn around when they are ready to return home. When we do get back, they immediately go to the water dish and drink and then lay on the cool tile.
I think it's heartbreaking if pets are left out in extreme heat and if I see it I call the SPCA and inform them.
Our cats don't outdoors at all but they do like it on out back lanai where it is totally enclosed and in the shade.
Danyel