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EQUINE DERMATOLOGY ISBN 0-7216-2571-1 Copyright © 2003, Elsevier Science (USA). All rights reserved.
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NOTICE
Veterinary Medicine is an ever-changing field. Standard safety precautions must be followed, but as new research and clinical experience broaden our knowledge, changes in treatment and drug therapy may become necessary or appropriate. Readers are advised to check the most current product information provided by the manufacturer of each drug to be administered to verify the recommended dose, the method and duration of administration, and contraindications. It is the responsibility of the treating veterinarian, relying on experience and knowledge of the patient, to determine dosages and the best treatment for each individual animal. Neither the publisher nor the editor assumes any liability for any injury and/or damage to animals or property arising from this publication.
International Standard Book Number 0-7216-2571-1
Acquisitions Editor: Ray Kersey Developmental Editor: Denise LeMelledo Publishing Services Manager: Linda McKinley Project Manager: Jennifer Furey Designer: Julia Dummitt Cover Design: Sheilah Barrett
Printed in United States of America
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Preface and Acknowledgments
quine skin disorders are common and important. After dogs and cats, horses are the most Ecommon species presented to our Dermatology Service and telephone consultation service for evaluation. In general, the equine dermatoses seen worldwide are similar both in nature and frequency.1-8 Very little information is available concerning the demographics of equine skin disorders. A survey carried out by the British Equine Veterinary Association in 1962 and 1963 indicated that 2% of all cases seen by the membership were presented for skin disease.9 A 1989 survey of the members of the American Association of Equine Practitioners revealed that skin disorders were the fourth most common medical problem encountered (following colic, viral respiratory tract disease, and endometritis).10 The top 10 equine health problems as determined by a survey of horse owners included skin diseases, which ranked number 9.11 Panel reports of veterinary practitioners in 1975, 1981, and 1986 found that dermatophytosis, dermatophilosis, urticaria, insect hypersensitivities, onchocerciasis, eosinophilic granulomas (“nodular necrobiosis”), papillomas (“warts”), sarcoids, photodermatitis, and nutritional “seborrheas” were the most commonly encountered equine skin disorders.4-6 In a 21-year (1979- 2000) retrospective study of equine skin disorders at the College of Veterinary Medicine at Cornell University, 4.1% of all horses examined at the Large Animal Clinic were evaluated by a dermatologist for skin problems (Tables 1 and 2).12 There was no breed predisposition for skin