Do not leave your dog unattended in a public place, even if they are tied up or left in the car. Not only could this be considered illegal in some cities, but it could also be dangerous. The temperature on the inside of the car can get much hotter than the temperature outside. If your pet is tied up outside, they could get loose and inadvertently run into the street while trying to find you. Your pet could also be frightened without you there to protect them and may try to bite someone. And whether your pet is inside the car or tied up, someone who does not like animals could be cruel to your pet and even hurt them. If your dog is friendly and approachable, someone may steal them.