The random one is OK, but has nothing special about it (other than the subject). It's clean, well framed, nicely exposed and has a sufficiently uncluttered background. Some eye contact would have really made it stand out (for me)
I quite like #1 though. It's an unusual (and interesting) view of the dog. So I'm going to say I like it, but I couldn't really tell you why (no help there!).
Ian.