How to Persuade your mum to get a dog?

I really want a Jack Russell I will look after it and I will keep my word I have good grades as well I really want a dog but my mum says no but she is not as bad before it would be a straight answer saying no but now we will have a chat about a dog I really want one I've tried everything; PowerPoints, facts, cute pictures, promises but nothing seems to work so I need loads of good and bad points about Jack Russell's. So please help really long Answers if you can ways of persuading and good and bad points what I can do if I go away will I get bored so please a long answer thanks guys ! I'm begging you!☺

wow shame man, anyone who wants to have a pet as badly as you obviously do should in my opinion have an opportunity to have one and experience the love that comes with it.
Jack's are hyper from what I remember of my grans dogs. They are good jumpers.
Also if I remember correctly they are champion rat killers.
When I was younger I badly wanted a pet and my parents said no.
So I got one anyway and told my mother that it followed me home after school.
Put "missing" notices up and obviously no one came to claim my pet. My mother fell more in love than what I did. Worked like a charm :)
Good luck and I really do hope that you get your pet, nothing like the love of a dog!

P.S Follow this link and check out the video...
http://animal.discovery.com/tv-shows/dogs-101/videos/jack-russell.htm