Another Thing I Don't Understand...

I am a parent, but not the parent of a daughter (not yet anyway...hopefully someday). However, I just don't understand how a parent could let their teenage daughter out of the house (hopefully they didn't see her) with a dog collar and chain attached around her neck. I was driving out of my neighborhood tonight and there stood a 15-16 year old girl with a dog collar and chain around her neck and her "boyfriend" was holding onto the chain. What kind of message is the young girl hoping to send and/or receive with that accessory?