An acceptable temperature for pets in cars is generally the same as for humans. It's important to remember that temperatures inside a parked car can rise rapidly, even on relatively mild days. As a guideline, it is generally recommended that pets should not be left unattended in a car when the outside temperature exceeds 70 degrees Fahrenheit (21 degrees Celsius). However, this temperature can still be dangerous depending on factors like humidity, ventilation, and the duration of time the pet will be in the car.
It's important to note that leaving pets in a parked car, even with the windows cracked open, can lead to heatstroke, organ damage, or even death. Animals are more sensitive to heat than humans and are unable to regulate their body temperature effectively.
If you need to travel with your pet, it's best to keep them with you inside the vehicle or make arrangements for someone to stay with them outside of the car. Additionally, it's important to provide your pet with plenty of water and ensure that the car is properly ventilated and cooled if you need to leave them alone for any brief period. Always prioritize the safety and well-being of your pets in hot weather conditions.