Dwarfism (DWF) is characterized by abnormal growth, leading to either a disproportionate body type or overall smaller body size. Horses with DWF often have a wide range of physical ailments and limitations, including breathing problems and eating difficulties.

Equine Arteritis Virus Resistance (EAVR) is an infectious disease with a broad range of symptoms, though most horses will not display any overt signs. Infection can result in abortion in pregnant mares, and some stallions persistently shed the virus through their semen.

Equine herpesviruses are DNA viruses that are found in most horses all over the world, often without any serious side effects. Following infection of Equine Herpesvirus Type 1 (EHV-1) some horses then suffer Equine Herpesvirus Myeloencephalopathy (EHM), which is is accompanied by serious and sometimes fatal neurological effects. EHM in horses can have serious neurological symptoms on affected horses.

Equine Metabolic Syndrome (EMS) is a wide-spread issue in the horse population. Primarily characterized by hyperinsulinemia (excess insulin circulating in the blood in relation to glucose levels), this metabolic disorder is often present in obese horses and ponies and can be challenging to diagnose as it can be misdiagnosed as "Cushing's" (a pituitary disfunction).