Heat stroke is when the body overheats, which can lead to damage to vital internal organs like the liver, kidneys, and even the brain. Body temperatures can range between 104 and 108 degrees. Heat stroke is treatable if addressed very early, but is often fatal. The key is recognizing the symptoms and acting quickly if you see any of the signs discussed below.
First of all, there are some dogs which are more prone to overheating. Brachycephalic (short-nosed) breeds like Bulldogs, Pugs, and Shih Tzus have a more difficult time regulating their body heat. Overweight dogs may also be more sensitive to temperature changes, as well.