This Picture Puzzles book offers more than 140 dog themed picture puzzles designed to challenge your powers of observation. Pictures that seem identical are presented on the same page, but subtle changes have been made to one of the pictures it's up to you to spot the differences. The book is divided into four sections of picture puzzles, ranging from easy to difficult. Features photos of dogs of all shapes and sizes, in everyday settings and unusual. Solutions to all puzzles are provided in the final section of the book. Spiral bound, 192 pages. The Brain Games Picture Puzzles book series was developed to challenge your powers of observation and stimulate your ability to focus and concentrate. All books in the series contain unique content.