if its cold out and you just have to rn in and out of the grocery store its fine but not for a long period of time, hot or cold, but i dont understand why you guys are getting mad at the fact that she is gettin left in the car alone...im 15 and i stay in the car by my self all the time especially when my mum goes to the boring grocery store, but unlike dogs we can choose to get in and out of the car...