Which of the following is a sign of heat stroke in dogs?

Loud panting is a significant indicator of heat stroke in dogs. When dogs become overheated, they will often pant as a way to regulate their body temperature. Panting helps to cool them down by evaporating moisture from their tongue and lungs. In heat stroke, this panting can become exaggerated, as the dog's body is unable to cool itself effectively.

Recognizing this symptom is crucial for dog owners, as it can indicate that a dog is in distress due to high temperatures. Timely intervention, such as moving the dog to a cooler environment and providing water, can prevent further complications associated with heat stroke. Other signs of heat stroke may include drooling, weakness, and even unconsciousness, but loud panting is often one of the first noticeable symptoms.