What kind of dog should I buy?

Hi,

I'm Argentine and my name is Martin and I write because I read something interesting on your web page. I would like to know if you could answer this question!!!

My family is going to buy a dog and we are in feud between and retriever or rottweiler. I like rottweiler but my mother says that they are dangerous especially with children. I would like to know if you agree with her and if you can send me information about rottweiler!!

Thank you.