I don't see why it wouldn't be a good 'deal', although don't be disappointed if they turn you down. I wouldn't tell them hat you're going to be more repsonsible or that you're going to show responsibilty to get a dog, because then they'll just think you're going to quit after you get what you want (not say that you would.) Especially don't be sad if the dog you have your eyes on is snatched up quick or gone by that time.

I'd just bring it up that you'd really like a dog, and since the next really special day is your birthday, and it gives them alot of time to think about the big decision, that you'd like to add a new member to the family. Ask them to drive you to the pound frequently so you guys can look at the different dogs and talk to them. I promise you there will be one all of you fall in love with. It may not be 'the one' but it will get you closer and closer to 'the one'. (Gee, can you tell i've done this before? )

All in all though, it's Katie's decision.