I wish I was closer to you -- I dogsit right now while getting through college.
I walk a few dogs daily and I charge $10 per day but that's only for a 30 minute walk. Overnights, I usually get about $20-$30 per night. I'm pretty flexible though and don't necessarily have 'set' prices... I dogsit 2 Boxers and make about $160 for a 3-4 night weekend. I also dogsit a Rottweiler overnight and also make $160 for a long weekend and that's only one dog. That's me going to their house, btw.