How to convince my mom AND dad to let me get my own dog?

I REALLY want a dog. My mom wont let me get one until we move to our new house. (which is in 12 days not counting today) I have ALL the money for the food, toys, etc. I also have this feeling that my mom doesnt think im responsible enough. (only because i dont do the things she tells me at the place we live now because we live in a stupid duplex) Im HOPING shell say yes. But, I know shell say no just because shes that type of person. So any advice, or suggestion are HIGHLY appreciated!