Overall, a lovely set!
1) I really like the idea and the level you were on, but the focus being on the background kind of bugs me. I wish it were on the dogs; then this shot would go from good to great!
2) Fantastic! I love everything about it - lighting, composition, colors, etc...
3) I agree with the others about the legs, but given your situation I'd still say it's a nice shot.
4) The one on the left is a little washed out to me (maybe some more contrast or something), but the one to the right is gorgeous! Love it.
5) Really pretty, albeit a slight bit blown out.
6) I like it! The fur in the dog's eye is really silly and made me laugh. She has a gorgeous smile and I love the teal behind them.
7) It's nice. Maybe crop a tiny bit more from the bottom?
8) Really, really lovely! Backlighting is gorgeous.