A whole lot of What Pet Should I Get? is about the difficulty of making up your mind. The kids in the book have been sent to the pet shop with a simple task: Choose one pet, buy it, and be back home by noon. But this task turns out to be way more complicated than the narrator imagined. The kids simply cannot make up their minds. They know they nave to pick out a pet that they both love, and they know that they have until noon to do so, but every time they turn around there's another cool animal to look at. Ugh.

How can they make up their minds when they haven't seen all the animals that the world has to offer? How can they decide when they keep seeing new critters that look so fun and interesting?