How To Convince My Parents To Let Me Get A Dog?

I am 15 and I wanted to get a puppy ever since I could remember! I know a lot about them and researched about them and told my parents that too. My dad is sort of in-between but my mom is totally against it! She has had 3 dogs when she was little. This was in India, and she told me that in India dogs were able to roam freely everywhere and so it was easier to take care of because of the wide space. I agree because I have been there and there really are dogs every where. But I don't understand why I can't have one here in Canada!! She also say that they smell. Anyways I really really want a dog and every one in my family knows it but no one wants to get me one. Also if this helps, I am choosing to get either a Golden Retriever, American Eskimo(The dog my mom use to have in India), West Highland Terrier or a Labrador Retriever =( any ideas or suggestions would be grealy appriciated!