If you have to convince your Mom, maybe theres a reason you shouldn't have a dog? If the thought is drifting, ask her why. My mother dislikes the thought of a mess by a dog in our house, yet we have two(we used to have more, but they passed away) because I pledged full responsability for everything, which later took toll on me. Every accident cost me, and every broken or chewed thing meant trouble for me. Now that I think about it, my mom was dead right about what a great responsability pets are. Make sure you have enough time to train a dog,exercise one, and spend time with it. Neglected pets would be better off in a shelter where they would be cared for atleast.Please, please, make sure your ready for a dog, they are tough work.