If your dog is out in the heat for a prolonged period of time, you need to keep an eye out for heatstroke. The Humane Society reported that dogs experiencing heatstroke exhibit “heavy panting, glazed eyes, a rapid heartbeat, difficulty breathing, excessive thirst, lethargy, fever, dizziness, lack of coordination, profuse salivation, vomiting, a deep red or purple tongue, seizure and unconsciousness.” If you notice these signs, get your dog to a cool space and head over to the vet as soon as you can. According to the American Kennel Health Canine Health Foundation, giving your dog a “voluntary head dunk in 70°F water” can also improve their situation.