I take both of my boys with me when ever the weather is nice. If I am running in and out or picking up my kids from school they will stay in the car and wait. I leave the window cracked open. I don't worry about someone taking them. They would have to get pass my Boxer in order to get to Snickers. Seamus is about 80 plus pounds of muscle. He is not a barker, but the stare he gives strangers is enough to make them cross to the other side of the street. He is good natured though.