Cooling vest for dogs — to be dampened

A dog does not sweat: it sheds heat by panting, and that stops being enough above 28 °C. Water-retaining fabric vest. Soak it, wring it, fit it: evaporation lowers the temperature across the back for two to three hours. Worth knowing: it stops working the moment it dries, and a dry vest on a hot dog does the opposite of what you want. Re-wet it, or take it off.