This book is a real-life look at the growing profession of pet sitting. It is a candid look at the author's experiences, and offers helpful hints and advice for potential sitters.
Not only does the author give obscure tips (make sure owners didn't lock screen door and exit through the garage) that you'd never think of, she gives personality advice on who will make it and who won't.
In my opinion, one would find it more lucrative to just do cats and not do dogs (which are HIGH maintenance for sure). But the author is a better person than I am in terms of doggie devotion. I'd be in the middle of the street screaming at some of the things that happened to her.
The only thing I disagreed with was her estimation of the income potential, which was low. I think cats and birds would put it much higher than office work. The dogs pull it down. Read it and see for yourself.