Daniel Roberts 
Harrison and His Dinosaur Robot and the Purple Spotted Sea Monster [EPUB ebook] 

On a hot summer’s day, Harrison and his dinosaur robot decide to share their new wading with their friends… until a purple spotted sea monster comes along wanting the pool to itself. Can Harrison and dinosaur robot come up with a way to defeat the mysterious bully sea monster and teach it a lesson on sharing? Find out in this fun, humorous and colorful third book in the "Harrison and his Dinosaur Robot" series from cartoonist Daniel Roberts.