Yes, i agree prevention is the best and sometimes the only way to go.

I've heard sad news that two dogs died because of heatstroke last week. The Brit who lived in Hong Kong thought it was good to take his two golden retrievers to go hiking....at the temperature of 35 degree. When they showed the symptom of heatstroke, he kept hiking until both dogs were in coma. A helicopter was dispatched to save them, and other hikers sprayed water over the dogs, but they all died.

That is too big lesson to handle.