Spray bottle with a bit of rubbing alcohol to increase evaporate effect spritzed on paws, belly, inner thighs. Acclimation and thoughtful exercise. I know you are cautious and trying to give her a little bit more help. My BC runs hot, too. He comes inside and dives onto bare concrete or his cooling mat. I don’t always remember to put the cooling mat in the freezer or fridge and he still seeks it out. Does she like to chew ice? Frozen kongs?
I don’t think the coats will help a light-colored whippet. I like them best for keeping sun off a dark-colored dog when it has to loiter around in the sun. Too bad we can’t sweat-scrape our pups. I’m not sure there’s a whole lot more you can do, especially since she’ll be in AC soon. I bet she cools down in an appropriate time frame. Interestingly, I read once that heat stroke is more frequent in cooler months when owners are not as conscious about exercise-induced overheating.
Acclimation and care are really the best tools. Oh! And walking her out. So many dog people skip that step and shove hot dogs straight from sprinting into crates. I know you won’t!
ETA: would a frozen hand towel or washcloth be easier in the freezer space equation? Peke people carry ice packs like I carry chapstick :lol:. Somehow I doubt a sighthound would appreciate it as much!