Conditions

Spasmodic colic is one of the most common — and typically milder — forms of colic in horses. It occurs when the muscles of the intestines contract suddenly and irregularly, causing brief episodes of abdominal discomfort. This type of colic...

Caffeine toxicity in horses is an uncommon but important condition that can occur when horses are exposed to coffee by-products, cocoa materials, or contaminated feed. While caffeine is widely recognized as a stimulant in humans, its effects in horses have...

Tooth root abscesses, or apical infections, are a painful and relatively common dental condition in horses that often develop gradually before more obvious signs appear. Because equine teeth are long and closely connected to surrounding structures like the sinuses, infection...

Aspiration pneumonia is a potentially serious lung condition that occurs when feed, water, saliva, or medication is inhaled into a horse's airways instead of being swallowed into the esophagus. Rather than developing on its own, it most often arises as...

Congenital stationary night blindness (CSNB) is an inherited vision disorder that affects a horse's ability to see in low-light conditions. Horses with this condition typically have normal vision during the day but may struggle to navigate safely at dusk, in...

Fleas in horses are uncommon, but they can still cause skin irritation, itching, and discomfort when infestations occur. While horses are not a preferred host for fleas, they may become temporary hosts after exposure to infested animals such as dogs,...

Pica in horses is a condition characterized by repeated ingestion of non-food items such as dirt, sand, wood, bedding, or manure. Unlike normal foraging behavior, pica involves actively seeking out and swallowing materials that do not provide nutritional value, which...

Congenital myotonia in horses is a rare, inherited neuromuscular disorder that affects how muscles relax after contraction. Instead of returning quickly to a resting state, affected muscles remain contracted for longer than normal, resulting in temporary stiffness that is often...

Autoimmune disease in horses occurs when the immune system mistakenly attacks the body's own tissues instead of protecting against infection. Rather than targeting bacteria, viruses, or parasites, the immune response becomes misdirected, leading to inflammation and tissue damage. Although autoimmune...

Rat poisoning in horses occurs when horses accidentally ingest rodenticides, which are pesticides used to kill rats and other rodents. Exposure can happen through contaminated feed, water, pasture, or bedding, especially in barns, tack rooms, and feed storage areas where...

Nightshade poisoning occurs when horses ingest plants from the genus Solanum, a group that includes several species that produce toxic compounds. Plants such as black nightshade (Solanum nigrum), bittersweet nightshade (Solanum dulcamara), and horse nettle (Solanum carolinense) contain naturally occurring...

Rhinopneumonitis in horses, commonly called "rhino," is a contagious respiratory disease caused by equine herpesviruses (EHV-1 and EHV-4). These viruses are widespread in horse populations worldwide, and most horses are exposed at some point in their lives. While many cases...

Upper airway obstruction can have an immediate impact on a horse's ability to breathe, perform, and stay comfortable, especially during exercise. Because horses rely entirely on their nasal passages for airflow, even small changes in the structures of the throat...

Allergies are a common yet often misunderstood source of skin and respiratory problems in horses. Many owners recognize issues such as colic or lameness, while allergic reactions receive less attention despite causing significant disruption when symptoms become chronic, recurring, or...

Threadworms (Strongyloides westeri) are an equine intestinal parasite that primarily affects newborn foals, making them one of the earliest parasitic concerns in young horses. Transmission often occurs through the mare's milk, allowing larvae to establish in the foal's intestines within...

Raised, red, or itchy swellings on a horse's skin are commonly described as hives, wheals, or urticaria. While the terminology may differ between veterinarians, owners, or practitioners, they all refer to the same physiological reaction. "Hives" is the common term...

The equine digestive system is a remarkably complex and sensitive network of organs, adapted to process a steady supply of forage around the clock. When its delicate balance is disrupted, the horse's ability to process and absorb nutrients is affected....

The equine gastrointestinal system is one of the most complex parts of a horse’s body. Designed for nearly constant grazing, a horse’s digestive tract depends on a steady flow of forage, water, and beneficial microbes to function properly. When this...

Lens luxation is an uncommon but serious eye condition in horses. It occurs when the lens — the clear, flexible structure inside the eye that helps focus light — slips out of its normal position. This displacement can cause pain,...

Swollen sheath in horses is a common condition that owners may notice when the area around the penis appears enlarged or puffy. In many cases, sheath swelling is mild and temporary, often linked to inactivity, seasonal changes, or fluid retention...

The sacroiliac joint (SIJ) is one of the largest and most important joints in the horse’s body, yet it is also one of the least understood. Situated deep within the pelvis, the SIJ forms the critical connection between the sacrum...

Most horse owners know that poor air quality in dusty barns can cause coughing, nasal discharge, or laboured breathing in sensitive horses. But what happens when a horse seems worse outdoors—even on fresh green pasture? Just like people, horses can...

The New World screwworm (Cochliomyia hominivorax) is a highly destructive parasitic fly that poses a significant threat to equine health and welfare. Unlike typical fly larvae that feed on dead or decaying tissue, screwworm maggots consume living flesh, resulting in...

The coffin bone, also known as the distal phalanx or P3, sits at the very tip of the horse's limb, completely encased by the hard hoof wall. Its unique shape provides the foundation for weight-bearing and shock absorption with every...

Inflammatory Airway Disease (IAD) is a common, performance-limiting respiratory condition that affects horses of all breeds and disciplines, particularly young to middle-aged animals in training. Part of the equine asthma spectrum, IAD is characterized by airway inflammation and increased mucus...

Keloids are an overgrowth of scar tissue that forms at the site of an injury in humans, extending beyond the original wound boundaries. They are dense, fibrous, and typically raised, smooth, and shiny in appearance. While horses do not develop...

Aural plaques in horses are a skin condition characterized by thick, pale, crusty patches that develop on the inner surface of the ears. These plaques may begin as small, raised bumps and can gradually merge into larger areas of raised,...

Squamous cell carcinoma (SCC) is one of the most common tumors affecting horses, originating in the squamous epithelial cells that form the outermost layer of the skin and line various internal surfaces. This condition can develop in a wide range...

Hoof capsule avulsion, or hoof degloving, is a traumatic injury that can severely impact a horse’s ability to move and function normally. The hoof plays a vital role in supporting the horse's weight, absorbing shock, and maintaining balance, which is...

Zoonotic diseases (zoonoses) are illnesses that are contagious between animals and humans. Horses can contract and transmit several different zoonotic diseases to humans, including rabies, anthrax, methicillin-resistant Staphylococcus aureus (MRSA), and ringworm. These pathogens represent three different types of microorganism...