Horse vomiting & diarrhea

Cryptosporidiosis in horses is an infection of the intestine by the protozoa known as *Cryptosporidium*.

Potomac horse fever (PHF) is an intestinal infection caused by Neorickettsia risticii, a bacteria that is transmitted from a parasite affecting snails, to aquatic insects, and then ingested by the horse.

Strongyles are a group of highly infectious parasites that spend part of their life cycle in horses’ lower intestines.

Equine viral arteritis (EVA) is an uncommon, highly contagious viral disease of horses. EVA is spread through inhalation of viral particles, direct contact with infected horses or contaminated equipment, and from infected semen.

Anthrax in horses is a rare disease caused by infection with the spore forming bacteria Bacillus anthracis. The disease results following spread of the bacteria throughout the body, and subsequent production of a deadly toxin.

Jimsonweed toxicosis is a rare and potentially life-threatening condition in horses that occurs from ingestion of jimsonweed (Datura stramonium). Jimsonweed plants contain a wide array of toxins that cause abdominal pain, dilated pupils, difficulty breathing, reduced appetite, and collapse.

Nightshade poisoning is a rare and potentially life-threatening condition in horses caused by the ingestion of plants in the nightshade family (Solanaceae spp.), including potatoes. Symptoms of nightshade poisoning include abdominal pain, diarrhea, incoordination, and seizures.

Blue-green algae poisoning occurs when horses ingest a toxic dose of cyanobacteria. Cyanobacteria, commonly referred to as blue-green algae, are a group of bacteria that live in aquatic ecosystems (e.g., ponds, lakes, and creeks). 

Hemlock poisoning is a potentially life-threatening condition in horses caused by the ingestion of a toxic dose of the Conium maculatum plant, also known as hemlock or poison hemlock. 

Alsike clover toxicosis is a potentially life-threatening condition caused in horses by the ingestion of the Alsike clover (Trifolium hybridum). Ingestion of Trifolium hybridum can cause two syndromes: liver failure and dew poisoning (Photosensitivity)

Aflatoxins are a group of fungal toxins produced by *Aspergillus* fungi, which grows on a number of feed crops, such as corn, peanuts, and soybeans. 

Slaframine toxicosis occurs when horses ingest high levels of slaframine toxin. Slaframine is a fungal toxin produced by the Rhizoctonia leguminicola fungus, commonly found on the red clover plant, alfalfa, and legumes. Slaframine toxicosis is not life threatening.

Anterior enteritis (AE), also known as proximal enteritis, is inflammation of the first two parts of the small intestine - the duodenum and the jejunum. The cause of AE in horses is suspected to be clostridial infection, although currently causes are not completely understood.

Right dorsal colitis (RDC) is an ulceration of part of the large intestine, the right dorsal colon, as a side effect of non-steroidal anti-inflammatory drugs (NSAIDs). Although RDC is usually connected to high doses or prolonged ingestion of these drugs, some cases involve normal usage in inherently sensitive horses.

Colic simply refers to pain in the abdomen, and does not provide any specific details regarding what organ system is affected or what underlying condition is occurring.