The author has completely revised his book for the Fourth Edition, paying particular attention to recent developments in our understanding of gut worm resistance to medicines, the increased prevalence of Caseous lymphadenitis and changes to scrapie controls in the EU. Topics such as farm biosecurity and herd health plans have been added and the section on notifiable diseases expanded to make this a more comprehensive book on all aspects of goat disease. He also includes many new colour photographs (for the first time integrated with the text).