As you've probably already read Shelties are very smart, but that means they also get bored easily and when mine get bored they chase each other around and bark. One of ours is noise sensitive so she barks more than our other two put together. The reason I'm mentioning this is that you never know what sort of sheltie you'll end up with. It could be one who's calm, cool and collected, or one that is hyper and loud. Considering you're in school, have a dog and will need to care for your mother I would really think this through before pulling the trigger. Too many shelties end up at the shelter or in rescue because people with the best intentions don't fully understand what they are getting into.