Pet Sitter Needed - Full-time / Part-time

Looking for overnight sitter in my home, which is within walking distance to downtown Ann Arbor. Billy the dog needs a morning and evening walk; he is very friendly, sometimes anxious (multiply rehomed before coming to me 3 years ago) , and 99lbs. Annie the aged cat needs very little and weighs about 10lb, on a good day. I was asked to indicate hourly payment, but I'm thinking there must be an option for a flat nightly fee? Happy to discuss details. Thank you!