This is really sketchy... How much is she willing to pay, if anything? How long does she want the arrangement for? What breed is the dog? Bit of a difference between a Yorkshire terrier and a German Shepherd dog. Don't get me wrong, I'm willing to cat sit for friends and close neighbours in the short term, as I have two kittens myself and I realize people end up in hospital or have to go somewhere and cats don't always travel well. But cats are easy, it's food, litter scoop, water, maybe chill with the cat for a while. But a dog? Totally different animal. Totally different needs and body language. I can see all kinds of potential drama here.