Heatstroke can happen in relatively mild temperatures from around 21 degrees Celsius and higher. If a dog’s body temperature exceeds 41.2c, it can even lead to organ failure, so it’s essential we know what to look out for. Heatstroke (also known as hyperthermia) describes a body temperature that has risen above normal limits. In this case, we’re looking at temperatures elevated by environmental factors rather than illness. Dogs who have been exercising vigorously in heat, are overweight, have underlying health problems or suffer from breathing difficulties, such as flat-faced breeds, are often the first to suffer. It’s also well publicised that leaving dogs in cars – even with windows open and water available – can quickly cause problems, even on a cooler day. Unlike us, dogs can’t sweat to control their body temperature but pant instead. Muzzled dogs can often suffer from heatstroke quite quickly as their ability to pant is restricted, so it’s essential to pay extra attention in these situations. Heatstroke is an immediate medical emergency, and if you think your dog might be displaying these symptoms, you need to act quickly to reduce their body temperature safely.