I just wanted to say that I am a varsity student (full-time), I work part-time, do a lot of community service, train for cycling tours and have a very active social life, and my yorkie, Cash, loves being part of it. I take him to parties (always keeping an eye on him), to the mall, to restaurants, to barbecues. He is with me in meetings and when I help people. The only time he stays home is when I am in class and I am working.
What I am trying to say is that you can take care of a dog and have a very active and busy life too. You just have to be committed to taking care of the dog in the best way possible.
You can do anything you set your mind to.