Never leave your pets in a parked car
Not even for a minute! Not even with the car running and air conditioner on. On a warm day, temperatures inside a vehicle can rise rapidly to dangerous levels. Your pet may suffer irreversible organ damage or die.

Limit exercise on hot days
Take care when exercising your pet. Adjust intensity and duration of exercise in accordance with the temperature. On very hot days, limit exercise to early morning or evening hours, and be especially careful with pets with white-colored ears, who are more susceptible to skin cancer, and short-nosed pets, who typically have difficulty breathing. Asphalt gets very hot and can burn your pet's paws, so walk your dog on the grass if possible. Always carry water with you to keep your dog from dehydrating.

Don't rely on a fan
Pets respond differently to heat than humans do. Dogs, for instance, sweat primarily through their feet. And fans don't cool off pets as effectively as they do people.

Provide ample shade and water
Any time your pet is outside, make sure they have protection from heat and sun and plenty of fresh, cold water. In heat waves, add ice to water when possible. Tree shade and tarps are ideal because they don't obstruct air flow. A doghouse does not provide relief from heat—in fact, it makes it worse.

Cool your pet 
Keep your pet from overheating indoors or out with a cooling body wrap, vest or mat. Soak these products in cool water, and they'll stay cool (but usually dry) for up to three days. If your dog doesn't find baths stressful, see if they enjoy a cooling soak.

Give your dog a pass on digging holes
Digging holes is a method of avoiding heat. Dogs in nature dig their dens not out of frustration but to find food, hide, give birth or keep cool! If possible, find a shaded area and dig your pet a small hole to keep cool.

Watch for signs of heatstroke
Extreme temperatures can cause heatstroke. Some signs of heatstroke are 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.
Animals are at particular risk for heat stroke if they are very old, very young, overweight, not conditioned to prolonged exercise, or have heart or respiratory disease. Some breeds of dogs—like boxers, pugs, shih tzus and other dogs and cats with short muzzles—will have a much harder time breathing in extreme heat.

Watch the humidity
It's not just the ambient temperature, but also the humidity that can affect your pet. Animals pant to evaporate moisture from their lungs, which takes heat away from their body. If the humidity is too high, they are unable to cool themselves and their temperature will skyrocket to dangerous levels—very quickly. Taking a dog's temperature will quickly tell you if there is a serious problem. Dogs' temperatures should not reach over 40 degrees. If your dog's temperature does, follow the instructions below for treating heat stroke.

How to treat a pet suffering from heatstroke
Move your pet into the shade or an air-conditioned area. Apply ice packs or cold towels to their head, neck and chest or run cool (not cold) water over them. Let them drink small amounts of cool water or lick ice cubes. Take them directly to a veterinarian.