It is certainly understandable why some owners may choose to leave a dog in a parked car occasionally. The errand may literally take only a few minutes to accomplish, for instance, or the establishment may not allow animals on the premises. Leaving a dog chained to a lamp post or bicycle rack could result in an unfortunate encounter with other animals or humans. A dog left outside could also be stolen or be exposed to hazardous weather conditions. There are some compelling reasons why owners might choose to leave dogs in parked cars.

But is this practice a good idea? There are some inherent problems owners must address when they leave a dog in a parked car. An unventilated vehicle can become a death trap within minutes on extremely hot days, so it is vital that owners provide proper ventilation by leaving the windows partially down while the dog is inside. Even this has some limitations over time, however, so it may be even better to park in the shade to reduce the build-up of heat.

Another consideration is the physical comfort of the dog. An owner who decides to leave a dog in a parked car has the ability to purchase a beverage to relieve thirst or visit a public restroom. Dogs in parked cars do not have those options. If the dog may be left in a car for an unknown length of time, an owner may want to provide some fresh water in a travel bowl. If a dog has not been given the opportunity to relieve himself or herself, it may be a good idea to let them out before leaving them in a parked car.

While it might not be illegal to leave a dog in a parked car, an owner may want to consider alternatives before putting a pet in an uncomfortable situation. Incidental errands to and from a dog park or a veterinary visit may be okay, but a situation where time may expand, such as a grocery run or a visit to the DMV, should most likely be postponed until the dog can be left at home or in the care of a responsible caretaker. Many dogs enjoy riding in cars with their owners, but they may not enjoy long periods of waiting in an overheated car without water, food or attention.

In short, it isn't necessarily a bad idea to leave a dog in a parked car for quick errands, as long as the car windows are partially rolled down for ventilation and the pet cannot escape. It is not a good idea, however, to leave a small animal in a hot car for hours at a time without providing ventilation or water. As long as owners take the same precautions as they would a small child in a car seat, there should be no harm in leaving pets in a parked car for short periods of time. If a pet doesn't necessarily need to be in the vehicle in the first place, however, it may be better to leave him or her at home rather than stuck in a small, hot space with little stimulation.