SOMMAIRE : 1. Differential Diagnosis and Diagnostic Tests 2. Diagnostic Techniques 3. Bacterial Skin Diseases 4. Fungal Skin Diseases 5. Parasitic Skin Disorders 6. Viral, Rickettsial, and Protozoal Skin Diseases 7. Hypersensitivity Disorders 8. Autoimmune and Immune Mediated Skin Disorders 9. Hereditary, Congenital, and Acquired Alopecias 10. Congenital Diseases 11. Pigmentary Abnormalities 12. Keratinization and Seborrheic Disorders 13. Miscellaneous Cutaneous Disorders of the Dog 14. Miscellaneous Cutaneous Disorders of the Cat 15. Diseases of Eyes, Claws, Anal Sacs, and Ear Canals 16. Neoplastic and Non-neoplastic Tumors 17. Before and After Cases