This book has been the go-to guide on sheep health, disease and production for veterinarians, farmers, farm advisors and veterinary, agricultural and applied science students since it was first published in 1993. Its authors are recognised internationally in the field of sheep health and production and have a lifetime of experience in the New Zealand sheep industry as well as wide exposure to sheep farmers working with practical production and flock health issues. This fourth edition is extensively revised and fully redesigned.