The story is simple enough for 1st graders to read, and funny enough for them to want to read it. The illustrations are bright, colorful, and inviting. I read this story to 1st graders, and then reviewed the story with them. They liked the dogs and their owners, and could easily relate to me their ordinal number. After we read through it once I had the children take turns being the dogs and their classmates put them in the proper order. This is a great way to introduce ordinal numbers, and to review the concept if you have already introduced the concept. The back of the book contains several ideas for extending the concepts in this story. I recommend this book for kindergarten and first grade students.