Topics in This Course

General Medicine


1. Clinical Examination and Making A Diagnosis →
  • Clinical examination of the individual animal
  • Making a diagnosis
  • Making a decision on therapeutics
  • Assessing the prognosis
  • Examination of the herd
2. General Systemic States →
  • Hypothermia, Hyperthermia, Fever
  • Septicemia, Viremia
  • Toxemia and Endotoximea
  • Hypovolemic shock
  • Allergy and Anaphylaxis
  • Edema and acid-base imbalance
  • Pain and stress
  • Localized infections
  • Inappetence
  • Weight loss
  • Care of recumbent animals
  • Sudden and unexpected death
3. Diseases of the newborn →
  • Perinatal and Postnatal diseases
  • Physical and environmental causes of diseases
  • Diseases of cloned offspring
  • Neonatal infection
  • Care of clinically ill newborns
4. Antimicrobial Therapy →
  • Principles of antimicrobial therapy
  • Practical usage of antimicrobial drugs
  • Antimicrobial resistance

1. Livestock Diseases by Body Systems


Diseases of the Digestive System →
  • General principles of digestive tract dysfunction
  • Manifestation of digestive tract dysfunction
  • Principles of treatment
  • Diseases of the buccal cavity, pharynx, esophagus, stomach and intestines
  • Diseases of the digestive system in ruminants
2. Diseases of the Liver and Pancreas →
  • General principles of liver dysfunction
  • Manifestation of hepatic and biliary dysfunction
  • Principles of treatment of hepatic dysfunction
  • Diseases of the pancreas
3. Diseases of the Cardiovascular System →
  • General principles of circulatory failure
  • Manifestation of circulatory failure
  • Diseases of the heart
  • Diseases of the blood vessels
4. Diseases of the Immune and Lymphatic System →
  • Abnormal concentration of plasma protein
  • Hemorrhagic diseases
  • Diseases of red blood cell numbers and function
  • Disorders of white blood cells
  • Diseases of spleen and thymus
  • Immune deficiencies
  • Amyloidoses
  • Porphyrias
5. Diseases of the Respiratory System →
  • Principles of respiratory insufficiency
  • Manifestation of respiratory insufficiency
  • Examination of the respiratory system
  • Treatment and control of respiratory tract diseases
  • Diseases of the lungs
  • Diseases of the pleura and diaphragm
  • Diseases of upper respiratory tract
6. Diseases of the Urinary System →
  • Principles of renal insufficiency
  • Manifestation of urinary tract disease
  • Examination of the urinary system
  • Treatment of urinary tract diseases
  • Diseases of the kidney
  • Diseases of the bladder, ureters and urethra
  • Congenital defects of the urinary tract
7. Diseases of the Nervous System →
  • Principles of nervous dysfunction
  • Manifestation of nervous system disease
  • Special examination of the nervous system
  • Treatment of diseases of the nervous system
  • The pathophysiology of nervous system disease
  • Diseases of the brain
  • Diseases of the meninges
  • Encephalopathies
  • Psychoses and Neuroses
  • Epilepsy
  • Diseases of the spinal cord
  • Diseases of the peripheral nervous system
  • Congenital defects of the nervous system
8. Diseases of the Musculoskeletal System →
  • Manifestation of musculoskeletal disease
  • Diseases of muscles
  • Diseases of bones
  • Diseases of Joints
  • Congenital defects of the musculoskeletal system
9. Diseases of the Skin, Conjuctiva and the external ear →
  • Principles of treatment of skin disease
  • Diseases of hair, skin glands, horns and hooves
  • Cutaneous neoplasms
  • Congenital defects of the skin
  • Diseases of the Conjuctiva
  • Congenital defects of the eyelids and cornea
  • Diseases of the external ear
10. Diseases of the Mammary Glands →
  • Mastitis
  • Defects of teats and udder
  • Mastits-Metritis-Agalactia in sows

Livestock Diseases by Etiology


Bacterial Diseases


1. Core systemic/zoonotic diseases
2. Clostridial diseases
3. Gastrointestinal diseases
4. Respiratory diseases
5. Reproductive diseases
6. Skin and soft tissue diseases
7. Production diseases (high economic impact)












Diseases Associated with Rickettsiales

1. Anaplasmosis →
  • Anaplasma marginale (bovine anaplasmosis)
  • Anaplasma centrale (milder form in cattle)
  • Anaplasma phagocytophilum (tick-borne fever in ruminants, granulocytic anaplasmosis)
2. Ehrlichiosis →
  • Ehrlichia canis (canine monocytic ehrlichiosis)
  • Ehrlichia ruminantium (heartwater in ruminants)
  • Ehrlichia ewingii (granulocytic ehrlichiosis in dogs)
3. Rickettsiosis →
  • Rickettsia rickettsii (Rocky Mountain spotted fever)
  • Rickettsia conorii (Mediterranean spotted fever)
  • Rickettsia africae (African tick bite fever)
4. Neorickettsiosis →
  • Neorickettsia risticii (Potomac horse fever)
  • Neorickettsia helminthoeca (salmon poisoning disease in dogs)
5. Q Fever →
  • Coxiella burnetii (important zoonotic reproductive disease in ruminants)
Other Related/Important Infections















Metabolic Diseases →
  • Ketosis (dairy cows, negative energy balance)
  • Milk Fever (hypocalcemia, parturient paresis)
  • Pregnancy Toxemia (ewes, does)
  • Hypomagnesemic Tetany (grass tetany)
  • Acidosis (ruminal acidosis)
  • Urolithiasis (urinary stones in ruminants)
  • Laminitis (linked to carbohydrate overload in horses/cattle)



Nutritional Deficiency Diseases →
  • Rickets (calcium, phosphorus, or vitamin D deficiency)
  • Osteomalacia (adults, similar to rickets)
  • White Muscle Disease (selenium/vitamin E deficiency)
  • Grass Tetany (magnesium deficiency)
  • Anemia (iron deficiency, especially piglets)
  • Pica (phosphorus deficiency)
  • Goiter (iodine deficiency)
  • Night blindness (vitamin A deficiency)

Diseases Caused by Physical Agents

Trauma & Mechanical Injuries →

Including Fractures, Wounds, Dislocations, Hematomas and Contusions.

Heat-Related Disorders →

Including heat stroke, heat exhaustion, burns and photosensitization.

Cold-Related Disorders →

Including frostbite, hypothermia, chilblains

Radiation-Related Conditions →

Sunburn (Solar dermatitis), Skin cancer, radiation burns

Pressure & Confinement Injuries →

Including Decubital Ulcers (Pressure Sores), Sole Ulcers / Laminitis, Myopathy (“Downer Cow Syndrome”).

Electrical & Lightning Injuries →

Electrocution and Lightning Strike Injuries

Drowning & Suffocation →

Drowning, Smothering and Aspiration Pneumonia

Other Physical Agents

Diseases Associated with Inorganic and Farm Chemicals

Heavy Metal Poisoning (Inorganic Compounds) →
  1. Lead Poisoning
  2. Arsenic Poisoning
  3. Mercury Poisoning
  4. Copper Toxicity
  5. Selenium Toxicity (“Alkali Disease” or “Blind Staggers”)
  6. Fluorosis
Fertilizers and Soil Chemicals →
  1. Nitrate/Nitrite Poisoning
  2. Ammonia/Anhydrous Ammonia Toxicity
Pesticides and Herbicides →
  1. Organophosphate Poisoning
  2. Carbamate Toxicity
  3. Chlorinated Hydrocarbon Poisoning (e.g., DDT, Lindane)
  4. Paraquat/Herbicide Poisoning
Rodenticide Toxicity →
  1. Anticoagulant Rodenticides (Warfarin, Brodifacoum)
  2. Cholecalciferol (Vitamin D analog rodenticides)
  3. Zinc Phosphide Poisoning
Disinfectants & Farm Chemicals Toxicity →

  1. Phenol Poisoning
  2. Cresol/Creosote Toxicity
  3. Formalin/Chlorinated Disinfectants
Other Notable Chemical Toxicities →
  1. Salt (Sodium Chloride) Poisoning / Water Deprivation
  2. Urea Poisoning (Non-Protein Nitrogen Toxicity)
Allergic Reactions in Animals →
  • Equine Recurrent Airway Obstruction (RAO/Heaves) – dust, moldy hay allergens
  • Atopic Dermatitis – dogs and cats (skin allergy due to pollen, dust mites, food allergens)
  • Flea Allergy Dermatitis (FAD) – hypersensitivity to flea saliva (dogs, cats)
  • Sweet Itch (Insect Bite Hypersensitivity) – horses (reaction to Culicoides bites)
  • Milk Allergy in Calves – hypersensitivity to milk proteins
Genetic Diseases in Animals →
  • Albinism – absence of pigmentation (all domestic species)
  • Chondrodysplasia (dwarfism forms) – dogs, cattle, sheep
  • Hydrocephalus – multiple species
  • Cryptorchidism (retained testes) – horses, dogs, cats, pigs
  • Polydactyly (extra digits) – cats, chickens, cattle
Genetic Diseases in Cattle →
  • Bovine Leukocyte Adhesion Deficiency (BLAD) – Holstein cattle
  • Complex Vertebral Malformation (CVM) – Holstein cattle
  • Bovine Progressive Degenerative Myeloencephalopathy ("Weaver syndrome") – Brown Swiss cattle
  • Deficiency of Uridine Monophosphate Synthase (DUMPS) – Holsteins
  • Factor XI Deficiency – Holsteins, Japanese Black cattle
  • Arachnomelia (spider calf syndrome) – Brown Swiss, Holstein
Genetic Diseases in Horses →
  • Hyperkalemic Periodic Paralysis (HYPP) – Quarter Horses, American Paint Horses
  • Polysaccharide Storage Myopathy (PSSM) – Quarter Horses, Warmbloods, draft breeds
  • Severe Combined Immunodeficiency (SCID) – Arabian horses
  • Hereditary Equine Regional Dermal Asthenia (HERDA) – Quarter Horses
  • Cerebellar Abiotrophy (CA) – Arabians
  • Lethal White Foal Syndrome (Overo lethal white, OLWS) – American Paint Horses
Genetic Diseases in Dogs →
  • Hip Dysplasia – large breeds (German Shepherds, Labradors, Rottweilers)
  • Progressive Retinal Atrophy (PRA) – many breeds (Collies, Irish Setters)
  • Collie Eye Anomaly (CEA) – Collies, Shetland Sheepdogs
  • Degenerative Myelopathy – German Shepherds, Corgis
  • Von Willebrand’s Disease – Dobermans, Shetland Sheepdogs
  • Muscular Dystrophy – Golden Retrievers
  • Cystinuria – Newfoundlands, Bulldogs
Genetic Diseases in Cats →
  • Polycystic Kidney Disease (PKD) – Persian cats and related breeds
  • Hypertrophic Cardiomyopathy (HCM) – Maine Coon, Ragdoll
  • Progressive Retinal Atrophy (PRA) – Abyssinians, Siamese
  • Hemophilia B – British Shorthair
  • Spinal Muscular Atrophy (SMA) – Maine Coon cats
Genetic Diseases in Sheep and Goats →
  • Spider Lamb Syndrome (Hereditary Chondrodysplasia) – Suffolk and Hampshire sheep
  • Hereditary Splayleg – sheep and goats
  • Goat Myotonia Congenita ("Fainting goats") – Tennessee fainting goats
  • Entropion (inward eyelids) – hereditary in some sheep breeds
Genetic Diseases in Pigs →
  • Porcine Stress Syndrome (PSS) – associated with malignant hyperthermia in Landrace, Pietrain
  • Rectal/Anal Atresia – hereditary defect
  • Congenital Tremors (type AII) – some pig lines
  • Scrotal/Ventral Hernias – hereditary predisposition
Genetic Diseases in Poultry →
  • Tibial Dyschondroplasia – broiler chickens, turkeys
  • Crooked Toes – hereditary trait in some chicken lines
  • Hypopigmentation ("Albinism") – rare genetic defect in poultry


Take Home

Animal diseases can arise from a wide variety of causes, broadly classified into infectious agents such as bacteria, viruses, fungi, protozoa, helminths, arthropods, and prions, as well as non-infectious factors including nutritional deficiencies, metabolic imbalances, toxins, physical agents, and exposure to inorganic or farm chemicals. Infectious diseases often spread rapidly within populations, while parasitic infestations may cause chronic production losses. Nutritional and metabolic disorders usually reflect imbalances in diet or physiology, and toxic diseases result from exposure to poisonous plants, microbial toxins, chemicals, or heavy metals. Physical agents such as trauma, heat, cold, and radiation can also cause significant injury and disease. In addition, some conditions are genetic, allergic, or multifactorial in origin, influenced by complex interactions between the animal, environment, and management. Together, these categories highlight the diverse etiologies of animal diseases and the importance of a comprehensive veterinary approach to diagnosis, prevention, and control.