ah mannnnn...can I keep him?

So my sister and I are to move out one of these years as you all know..supposedly near the first of the year..so the plan was..we were to get a dog for the new place..at Christmas...we agreed not to look for it yet because we all know we can't have it yet. Well me being the entergetic person that I am. I couldn't wait...so look what I found!! He's a little Australian Cattle Dog puppy (supposedly) and I want him!! They are (from what I researched) entergetic dogs that need exercise so I can go run with him!! How awesome it that?!..ok so we all know that puppies get snatched up soon....::sad face::..well I found a full grown dog..which would be more practical. He's even house broken. One small problem (other than the fact I cant even get a dog yet) he's too big. Oh and he suffers from separation anxiety and needs to be inside mostly..But look at his eyes!!