I know someone who is thinking about breeding her dog on her first heat. I know that you should not do that so I want to talk to her about it but I don't know the reasons to give her why it is bad? I know it's often compared to a 13 year old girl getting pregnant, but I don't know exactly what harm it can do to the dog. I want to be able to sit down and tell this person exactly what risks she would be putting her dog through if she goes through with this. I want to actually know what I am talking about so I don't just sound like I'm repeating rhetoric.