Record breaking temperatures in Arizona affects all members of the family. Heatstroke can be deadly. Here are the signs of heatstroke in dogs: excessive panting, lethargy, weakness, drooling, high fever, darkened gums, vomiting, rapid heartbeat, unresponsive to commands and collapse. Even short walks can create heat exhaustion in dogs during warm days. If your pet exhibits any of heatstroke symptoms, please contact Emergency Animal Clinic right away.