This one? It's on my top three list.
Cooling
I have an old Ruffgear which is the "old" model of this one and does seem heavy.
Ruffwear Swamp Coolerâ„¢ Dog Cooling Vest
Honestly Rocky is "panting" when his fur isn't even "hot" to the touch. it's internal. It starts and stops (because I am VERY careful and we stay closer to home and either stop to rest if he even starts, or i add water, generally close enough and managing enough to limit any "panting" when we get home. He isn't panting heavily, the issue is it's not "panting" per say it's just harder breathing cuz of the LP. So it's sorta crazy cuz in this heat my goal is litteraly ZERO panting. ZERO. but seriously, he pants all summer even as a young dog. Heck, young healthy dogs are panting! I think I need to chat with my vet, visits are always a bit of a world-wind even with all my questions.
Honestly the cost of the ice pack collars and jackets is nuts. I am really going to consider doing something DYI to at least test if it helps. I don't want to plop $300 on something that may give us...5 mins more. If I have a lightweight jacket and then sorta manage to wrap an ice gel back in a cloth and put it near his chest and strap it on. I can strap something gently around his neck to VS buy a cooling collar.