Even with the window down, the temperature in a parked car can be fatal in 5-10 minutes or less. Provide adequate ventilation and air circulation when pets are kept in kennels or pens. Get your dog groomed. This can not only make her more comfortable but summer skin problems can be caught early. Watch for hot pavement or beaches.
Sensitive paws burn easily.
Shorthaired dogs and those with pink skin are especially susceptible to sunburn. Limit their exposure. Also white cats are susceptible to skin cancer on the tips of their ears. Use sunscreen on them if they go outside often. Be sure your dog has been tested for heartworm and both your dog and cat are on heartworm preventive.