One day, I encountered a lovely dog Mocha and because of him, I have had a lot of fun every day and I have been happy with him. However, one day when he became a senior dog, he started suffering from a disease, perineal hernia. I wanted to make him free from pains of illness and decided an operation and decided to record the progress of Mocha's recovery. I was very glad to write this book because he became fine again. I hope this book will be heipful for owners to have and breed dogs.