Talk the talk, Walk the dog
I love every dog. I know that sounds like a joke but it's really not. I don't own one because I don't own a yard, please let me live vicariously through you. I have dog sat for my parents and my sister (a veterinary technician) for the past two years, and I work with dogs and cats at my day job. Your doggo will love me, because it will sense how much I love them.
What Sarah would like to know about your dog
How your dog behaves with other dogs (i.e. what to expect if we encounter another dog on a walk?), any specific things your dog dislikes (a particular spot they don't like to be pet?) and any special needs or requirements.