Very Common
Diagnostics Your Vet May Perform
Figuring out the cause of the problem. These are tests or procedures used by your vet to determine what’s wrong.
Media
Infectious Disease Triad
The factors that interact to determine whether a horse will get disease: Host, Environment & Agent. 
Diagnoses Your Vet May Consider
The cause of the problem. These are conditions or ailments that are the cause of the observations you make.
Very Common
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Pneumonia, Pleuropneumonia & Pleuritis, Generally
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Strangles
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Foal or Newborn, Necrotizing Enterocolitis, Bloody Diarrhea
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Rabies
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Equine Influenza, EI
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Contagious Equine Metritis, CEM
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Equine Herpesvirus 1 & 4, Rhinopneumonitis
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Potomac Horse Fever, Neorickettsiosis
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Lyme Disease, Borreliosis
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Equine Protozoal Myeloencephalitis, EPM
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West Nile Virus, WNV
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Leptospirosis
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Equine Proliferative Enteropathy, EPE
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Equine Granulocytic Ehrlichiosis, EGE
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Equine Herpesvirus 2
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Foal Pneumonia, Rhodococcus equi
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Tularemia
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Trypanosomiasis, Surra, Mal de Caderas
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Borna Disease
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Bacteremia, Septicemia (in Adult)
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Coronavirus Entero-Colitis
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Bacterial Infection, Generally
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Vesicular Stomatitis, VS
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Methicillin-Resistant Staphylococcus Aureus, MRSA
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Eastern, Western & Venezuelan Equine Encephalomyelitis
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Foal, Umbilical Infection or Abscess
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Hendra Virus, HeV
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Besnoitia, Besnoitiosis
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Equine Herpesvirus 3, Coital Exanthema
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Coccidioidomycosis
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Cellulitis
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Japanese Encephalitis
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Anthrax
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Equine Viral Arteritis, EVA
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Clostridial, Clostridium Colitis (in Adult)
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Brucellosis, Poll Evil, Fistulous Withers
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Salmonella Colitis (in Growing Foal or Adult)
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Tetanus
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Tuberculosis
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Bastard Strangles
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Pigeon Fever
Less Common
Treatments Your Vet May Recommend
A way to resolve the condition or diagnosis. Resolving the underlying cause or treating the signs of disease (symptomatic treatment)
Very Common
Less Common