This book aims to present the essential facts of the most common ruminant diseases and conditions in a problem based format. Clinical cases are not ordered in organ system, thereby mimicking the random presentation of cases during a busy round of calls in practice. The diagnosis and treatment regimens described herein are those used by the author over the past 30 years in commercial large animal practice in the UK; they acknowledge the time and financial restrictions in many situations but require no specialized facilities nor equipment. The book is designed for veterinary undergraduates during their clinical rotations, and for the recent graduate who encounters the occasional farm animal problem in mixed practice. All suggestions for further cases, comments, and suggestions will be gratefully received and acknowledged by the author.