The kennel our dog stays at just went up to $12 per day recently, plus $1 per extra walk. You could ask her how much she usually gets (or ask people who she's done this for before).

We're getting a housesitter when we go to Alaska for 9 days (we have one dog and 2 cats), and we're going to pay her $20 per day. She'll have to feed and walk the dog, feed the cats, scoop the litter, possibly clean up fur balls, keep an eye on things, in general. Well worth the extra dough to have the animals happy (the dog could go to the kennel, but that is a long time, and we could get somebody to look in on the kitties every couple of days, but, once again, it's a long time without a lap), and have somebody here to notice if something goes wrong. In the winter the job requires a lot more (we get lots of snow).

She's a college student, so she could use the money - plus she lives, works, and goes to school 20 miles away.

When we're gone for more than a few days, we like to know somebody responsible is here, and (as others have said) the pets are a lot happier.