The liver is the largest organ in the horse's body, making up one percent of its total body weight. Hepatitis refers to inflammation of the liver and is a non-specific term used to describe liver disease. The liver is a...
Conditions
Explore Mad Barn’s comprehensive list of common equine health conditions, detailing each condition’s causes, symptoms, treatment options, prevention methods, and prognosis.
A
- Abnormal Gestation
- Abortion (Stillbirth)
- Acquired Heart Murmurs
- African Horse Sickness
- Anaplasmosis in Horses (Equine Granulocytic Ehrlichiosis)
- Anemia
- Anhidrosis (Absent Sweating)
- Anthrax Poisoning
- Arrhythmias (Irregular Heart Beats)
- Arthritis
- Ascarids Parasites
- Atrial Fibrillation
- Aural (Ear) Plaques
- Autoimmune disease - Primary Immunodeficiency Disorders
B
- Back Pain
- Bartonella Infection
- Big Head Disease (Nutritional Secondary Hyperparathyroidism)
- Black Walnut Tree Poisoning
- Bleeding Disorders
- Blister Beetle Poisoning (Cantharidin Toxicity)
- Bog Spavin (Tarsocrural Joint Effusion)
- Bone Bruises
- Bone Spavin
- Botflies Parasites
- Botulism
- Bowed Tendons
- Box Elder & Sycamore Poisoning
- Brain Anatomy & Disease
- Bucked Shins (Dorsal Metacarpal Disease)
- Buttercup Poisoning
C
- Canker
- Capped Hock (Calcaneal Bursitis)
- Cataracts
- Caudal Heel Pain
- Cellulitis
- Cerebellar Abiotrophy
- Choke
- Chronic Progressive Lymphedema
- Coffin Bone Lameness
- Colic in Foals
- Colic Treatment, Management & Prevention Guide
- Colitis
- Congenital Heart Murmurs
- Congenital Hypothyroidism & Dysmaturity Syndrome
- Conjunctivitis (Pink Eye)
- Contagious Colitis
- Contagious Equine Metritis
- Corneal Ulcers
- Cranial Nerve Conditions
D
- Degenerative Joint Disease (DJD)
- Degenerative Suspensory Ligament Desmitis (DSLD)
- Dehydration
- Dental Disease
- Developmental Orthopedic Diseases
- Dew Poisoning (Alsike Clover Poisoning)
- Dislocated Eye Lens
- Displacement Colics
- Dorsal Displacement of the Soft Palate in Horses (DDSP)
- Dummy Foal Syndrome (Neonatal Maladjustment)
- Dysmastication (Abnormal Chewing)
- Dystocia (Difficulty Foaling)
E
- Ear Mites & Psoroptic Mange
- Eastern Equine Encephalitis (EEE)
- Endometritis
- Enlarged Ovaries
- Enteritis & Inflammatory Bowel Disease
- Enteroliths
- Epilepsy
- Equine Chronic Obstructive Pulmonary Disease (COPD)
- Equine Coronavirus (ECoV)
- Equine Degenerative Myeloencephalopathy (EDM)
- Equine Gastric Ulcer Syndrome (EGUS)
- Equine Grass Sickness
- Equine Herpesvirus
- Equine Herpesvirus-1 Myeloencephalopathy (EHM)
- Equine Infectious Anemia (EIA)
- Equine Metabolic Syndrome (EMS)
- Equine Motor Neuron Disease
- Equine Odontoclastic Tooth Resorption & Hypercementosis (EOTRH)
- Equine Proliferative Enteropathy (Lawsonia)
- Equine Protozoal Myeloencephalitis (EPM)
- Equine Viral Arteritis (EVA)
- Equine Wobbler Syndrome (Cervical Vertebral Stenotic Myelopathy)
- Exercise-Induced Pulmonary Hemorrhage (EIPH)
- Eye Conditions
F
G
H
- Hay Belly
- Hay Belly & Other Causes of Bloating
- Heart Disease
- Heat Stress
- Heaves
- Hendra Virus (Equine Morbillivirus)
- Hepatitis
- Hereditary Equine Regional Dermal Asthenia (HERDA)
- Hindgut Acidosis
- Hindgut Ulcers
- Hives (Urticaria)
- Hoof & Sole Bruises
- Hoof Abscess
- Hoof Anatomy & Conditions
- Hoof Cracks
- Hoof Degloving
- Hunter’s Bump
- Hyperkalemic Periodic Paralysis (HYPP)
- Hyperlipidemia & Hyperlipemia
- Hypothyroidism
I
- Immune Mediated Myositis (IMM)
- Impaction Colic
- Inappropriate Lactation
- Infectious Diarrhea in Foals
- Inflammatory Airway Disease
- Influenza Virus (Flu)
- Inguinal (Scrotal) Hernias
- Injuries: Endurance
- Injuries: English Performance
- Injuries: Racehorses
- Injuries: Western Performance
- Insect Stings & Spider Bites
- Internal Entrapments (Reasons for Colic Surgery)
- Internal Parasites
- Intussusception
- Ionophore Toxicosis
- Iron Overload
J
K
L
M
- Mange
- Mare Reproductive Loss Syndrome
- Mastitis
- Melanomas
- Meningitis
- Mesenteric & Omental Rents
- Migrating Grass Awns (Foxtails)
- Moldy Hay (Mycotoxin) Poisoning
- Monensin Poisoning
- Moon Blindness (Equine Recurrent Uveitis)
- Mosquito-Borne Equine Diseases
- Most Common Equine Allergies
- Mud Fever (Equine Pastern Dermatitis)
- Myofibrillar Myopathy (MFM)
- Myosin Heavy Chain Myopathy (MYHM)
N
O
P
- Parrot Mouth (Rostral Malocclusion)
- Pasture-Associated Laminitis
- Pedal Osteitis
- Physitis
- Pigeon Fever
- Pinworms Parasites (Oxyuris Equi)
- Piroplasmosis (Babesiosis)
- Pituitary Pars Intermedia Dysfunction (PPID, formerly Equine Cushing's)
- Placentitis
- Pneumonia
- Podotrochlear Syndrome
- Polysaccharide Storage Myopathy Type 1 (PSSM1)
- Potomac Horse Fever
- Progressive Ethmoidal Hematomas
- Protein Bumps (Eosinophilic Granulomas)
- Proud Flesh (Granulation Tissue)
- Proximal or Anterior Enteritis
- Purpura Hemorrhagica
Q
R
- Rabies
- Ragwort Poisoning (Pyrrolizidine Alkaloid Toxicity)
- Rain Scald
- Rattles in Foals
- Reproductive Emergencies in Mares
- Respiratory Diseases
- Retained Fetal Membranes (Placenta)
- Rhino in Horses
- Right Dorsal Colitis
- Ringbone
- Ringworm (Girth Itch)
- Roach Back (Kyphosis)
- Roaring (Laryngeal Hemiplegia)
- Rotavirus
- Ryegrass Staggers
S
- Sacroiliac Dysfunction
- Salmonella Infection
- Sand Colic
- Sarcoids
- Scours (Foal Heat Diarrhea)
- Scratches (Pastern Dermatitis)
- Seasonal Respiratory Allergies
- Selenium Poisoning (Alkali Disease)
- Sepsis & Toxic Shock
- Septic Laminitis
- Sesamoid Injuries
- Sesamoiditis
- Shelly Feet
- Shipping Fever
- Shivers
- Shoe Boils (Olecranon Bursitis or Capped Elbow)
- Sidebone
- Sidewinder Syndrome (Crab Walking)
- Sinusitis
- Skin Allergies
- Skin Diseases Guide
- Skin Irritations
- Slobbers (Slaframine Poisoning)
- Small Intestine Volvulus
- Smoke Inhalation Injury
- Sorghum & Sudan Grass (Cyanide) Poisoning
- Splints in Horses
- Squamous Cell Carcinoma (SCC)
- Staphylococcus & MRSA
- Stocking Up (Stagnation Edema)
- Stovepipe Leg (Lymphangitis)
- Stovepipe Leg (Lymphangitis)
- Strangles
- Strangulating Lipomas
- Stringhalt
- Strongyles Parasites
- Summer Sores (Habronema)
- Supporting Limb Laminitis
- Swayback (Equine Lordosis)
- Sweet Itch (Insect Bite Hypersensitivity)
- Swollen Sheath
- Synovial Joint Infections
T
- Tapeworms Parasites
- Tendon Injuries
- Tetanus
- Theiler's Disease (Equine Serum Hepatitis)
- Threadworms <em>(Strongyloides Westeri)</em>
- Thrush
- Thumps (Synchronous Diaphragmatic Flutter)
- Tick-Borne Disease [Guide]
- Top 30 Most Common Equine Diseases
- Top 6 Gastrointestinal Conditions in Horses
- Trigeminal Mediated Headshaking Syndrome
- Twisted Gut (Intestinal Torsion)
- Tying-up (Exertional Rhabdomyolysis)
- Tying-up (Exertional Rhabdomyolysis)
- Tyzzer's Disease
U
V
W
Z
Purpura hemorrhagica (PH) is a severe immune-mediated condition in horses characterized by widespread inflammation of blood vessels, known as vasculitis. This condition often develops as a secondary complication of infections, particularly those caused by Streptococcus equi, the bacterium responsible for...
Unlike the explosive speed of racehorses or the poised collection of hunter-jumpers, the endurance horse has a more specialized skillset. Endurances horses – and riders – work hard to go the distance. Riding in the range of 80 or more...
Small intestine volvulus is a serious condition in horses, characterized by a twisting of the intestine around itself and the root of the mesentery. This twist can cause a blockage, restricting blood flow and leading to severe damage to the...
Warts in horses, also known as equine papillomatosis, are small, benign growths caused by equine papillomaviruses (EPVs). These growths primarily affect young horses under the age of three, as their developing immune systems are more susceptible to the virus. EPVs...
Quidding is a term used to describe a horse dropping food from its mouth while eating. This can be a sign of dental problems as well as a number of other conditions. Regular dental care is of utmost importance to...
Ticks are small, blood-feeding arachnids with specialized mouthparts that allow them to attach to a variety of hosts, including humans, birds, reptiles, and mammals like horses. After attaching to a host, ticks use their mouthparts to feed on the host’s...
The protein lumps and bumps that are found on the neck and back of the horse are often eosinophilic granulomas. These are small, benign nodules that can develop under a horse's skin. They may occur as single bumps or develop...
The horse's brain is responsible for managing and regulating all bodily functions and behaviours. The cerebellum, located at the back of the brain beneath the occipital lobes, plays a vital role in coordinating and fine-tuning motor movements. Equine Cerebellar Abiotrophy...
Inguinal hernias, also known as scrotal hernias, are a condition where a horse's intestine slips through the inguinal canal and settles in the vaginal tunic. Inguinal rupture is where a horse’s intestine slips through a tear in the vaginal ring...
Cyanide toxicosis is a potentially fatal condition in horses which is caused by the ingestion of plants containing cyanogenic glycosides. Understanding cyanide toxicosis is essential for anyone involved in horse care. Over 3,000 plants worldwide are known to produce cyanogenic...
Intussusception in horses describes a condition where a segment of the intestine folds inward on itself, like closing a telescope. This condition primarily affects younger horses, particularly foals, but is occasionally seen in mature horses. Intussusception can lead to severe...
Conjunctivitis, also known as "pink eye", is an inflammation of the conjunctiva, the mucous membrane that covers the front of the eye and lines the inside of the eyelids. This condition is the most common acquired eye disease in animals....
The stifle is a complex joint in the horse's leg, comparable to the human knee. It comprises bones, ligaments, cartilage, and muscles that work together to enable movement and provide stability. This joint plays a crucial role in the overall...
Nitrogen compounds, crucial for fertilizers, have revolutionized agriculture, ensuring food security but they pose environmental risks such as water pollution and algae blooms. Horses, while less susceptible than ruminants to nitrate poisoning due to their digestive system, can suffer severe...
The conformation of a horse directly impacts their overall performance capacity, long-term soundness, and their potential in different disciplines of equestrian sport. The conformation of the hindlimbs is particularly important, as the hind legs provide the horse’s power, speed, and...
Ryegrass is a popular forage choice worldwide, and is a nutritious source of protein and energy for horses and other grazing animals. Although both species of ryegrass are good sources of nutrition and are not toxic in and of themselves,...
Horse owners have a vested interest in their horse's health, as health conditions can directly impact their horse's wellbeing, performance, and longevity. Understanding common horse diseases is crucial for anyone involved in equine care, as early recognition of the symptoms...
Capped hock refers to inflammation and swelling over the bony point of a horse's hock. The "cap" may be squishy or firm and is usually the result of trauma or repeated rubbing. Alongside the characteristic swelling, the horse may have...
Fibrotic myopathy is a rare condition in horses characterized by the development of fibrous (scar) tissue within the muscles, typically affecting the inner thigh muscles of one or both hindlimbs. Affected horses develop hindlimb stiffness, a distinctive hoof-slapping gait, mechanical,...
Sidewinder Syndrome, also known as sidewinder gait or crab walking, is one of the more perplexing and challenging equine health conditions for horse owners and veterinarians alike. This syndrome is characterized by a distinct sideways drift of the horse's trunk...
Seizures, while relatively rare in horses compared to dogs and humans, pose significant challenges for both horse owners and veterinarians. These neurological episodes, characterized by abnormal electrical activity in the brain, can manifest in various forms. During a seizure, a...
Tyzzer's disease, while rare, is a highly fatal hepatic condition that can affect all foals, including those which are healthy and well-nourished. The disease is not believed to be contagious, but the presence of bacteria in a contaminated environment can...
Wry nose is a congenital condition in foals where the nose appears twisted or crooked due to malformations that develop during gestation. This condition involves significant changes in the shape and direction of the upper jaw, nasal bones, incisive bones,...
Sesamoid injuries are a common and often serious equine injury. The small sesamoid bones play a large role in reducing tension on the muscles and tendons of the body. The proximal sesamoid bones (PSBs), located in the fetlock joint, play...
Horse racing is a thrilling sport, demonstrating the power and speed of equine athletes performing at their absolute best. From the raw speed and acceleration of Quarter Horses, to the impressive staying power of Thoroughbreds, to the jumping ability of...
Parrot mouth is a common equine dental condition typically identified at birth or shortly after. It is characterized by a pronounced overbite where the upper front teeth protrude beyond the lower row of teeth, causing the upper lip to overlap...
Hoof health is one of the pillars of overall horse health and well being. There are numerous conditions that can impact the horse's hooves, including quittor. Quittor is an infection in the collateral cartilage of the hoof often resulting from...
Atypical Myopathy (AM) and Seasonal Pasture Myopathy (SPM) are highly fatal muscle disorders in horses caused by the ingestion of seeds of the box elder or sycamore trees. Seeds of these species contain a compound called hypoglycin A that converts...
Glanders is one of the oldest diseases known to affect horses. It is a highly contagious and fatal disease that affects horses, donkeys, and mules, caused by the bacterium Burkholderia mallei. It poses a significant zoonotic threat, as it can...