Rollo is a dog that loves to go to work with his owner, Jim, who is a builder. Jim and his team of builders have been working on a house that Rollo has enjoyed visiting because the family like to give him lots of pats and the garden is nice and big, so he has lots of places to explore. One day, the builders are moving lots of big, heavy windows to a safe area. Rollo begins to explore this new part of the garden, and sniffs around. While Rollo is exploring, he tries to walk on a surface that he thinks is hard. Unfortunately, the hard surface is a pool cover and Rollo finds himself falling into a large swimming pool. Jim helps him out and everyone thinks it is very funny, except for Rollo. This book is ideal for teaching children about being safe around water and remembering to always close pool gates and never go near a pool without an adult.