I think you're ok
and I'm sure you love your dog. All of us are a little bit lazy though, and it's nice to get a break from responsibilities. Dogs can be a lot of work!
I've felt this way when I've gone on vacation, and trust me, I adore all the animals. We call them our babies, we call to check up on them when we're away, but it's nice not to have to feed them, pick up poop, worry about whos not in the room with us and what are they up to.
I've even felt this way about my boyfriend before. I enjoy Mondays when he's not home from school until late, I cook whatever I want, read a book, dance around the house to music he doesn't like, sometimes when he comes home early, I kinda wish he hadn't.
Of course I only feel that way because it's a short period of time, I know they are ok, and will be back soon. Coming home from work gets depressing without the enthusiastic greetings of 70 lb dogs, the ferrets jumping up and down in their cage, and a kiss from my bf.
So it's ok to enjoy a break, don't feel bad. I'm sure when you see your girl again, you will remember that all the work is worth it.
If you don't... well than maybe you are just putting too much stress on yourself as a dog owner. Food and walks are important, but she doesn't expect you to be perfect, and as long as she is healthy and happy, try not to worry too much. It is fun to have animals around!