With temperatures approaching 100 degrees and the first day of summer looming, here are some things to remember about dealing with heat.

Serious danger

Never leave infants, children or pets in a parked car. Even with the windows cracked open, interior temperatures can rise almost 20 degrees Fahrenheit within the first 10 minutes. Anyone left inside is at risk for serious heat-related illnesses or even death.

High risks

- Infants and children up to 4 years of age are sensitive to the effects of high temperatures and rely on others to regulate their environments and provide adequate liquids.

- People 65 years of age or older might not compensate for heat stress efficiently and are less likely to sense and respond to change in temperature. If they do not have air-conditioning and can't get to an air-conditioned place, doctors suggest they take a cool bath or shower periodically.

- People who are overweight might be prone to heat sickness because of their tendency to retain more body heat.

- People who are physically ill, especially with heart disease or high blood pressure, or who take certain medications -- such as for depression, insomnia or poor circulation -- might be affected by extreme heat.

Hot pets

Signs of heat exhaustion in a dog include heavy panting, a distressed or anxious look and weakness. If pet owners see such symptoms, they should take the animal to the nearest veterinarian immediately.

To avoid heat-related illnesses in animals, owners should provide fresh water and shade for their pet and avoid outdoor activity.

Cool tips

- Stay indoors and, if possible, in an air-conditioned place. E-ectric fans may provide comfort, but when the temperature is in the high 90s, fans will not prevent heat-related illness.

- Wear lightweight, light-colored, loose-fitting clothing.

- Don't wait until you're thirsty to drink fluids. Avoid alcohol and sugary drinks, which cause you to lose more body fluid.