Two sisters try to convince their parents to let them have one of their neighbour's puppies by proving they can be responsible for taking care of it, and paying for it's needs themselves. Along with two friends, the girls form their own business - Pets, Incorporated - to help neighbours with odd, animal-related jobs to earn money.
This is a cute book. There's not much in the story that would 'date' it badly (aside from the prices), the plot is still one that kids today can sympathize with, and I think it would still be entertaining to readers today.