Horse Show Biosecurity: How To Protect Your Horse From Disease

By Dr Duncan Houston

Horse shows are exciting for riders, but they are also perfect meeting places for infectious disease.

A showground brings together horses from different barns, regions, transport routes, vaccination histories and management systems. Most of the time, nothing dramatic happens. But when one horse arrives with a fever, nasal discharge, diarrhea or early neurologic signs, the same environment that makes showing fun can also make disease spread quickly.

The goal is not to be paranoid. The goal is to be prepared.

Good show biosecurity is not one product, one vaccine or one lucky charm in the tack box. It is a system: vaccination, temperature monitoring, personal equipment, no shared water, no nose to nose contact, hand hygiene, clean trailers, post show monitoring and fast isolation when something looks wrong.

Quick Answer

The best way to protect your horse from disease at shows is to combine current vaccination, daily health checks, temperature monitoring, separate buckets and gear, no nose to nose contact, good hand hygiene, clean stabling and post show separation when returning home. Events can spread diseases such as equine herpesvirus, equine influenza, strangles, diarrhea causing pathogens and ringworm through respiratory secretions, contaminated surfaces, shared water, equipment, people and transport. (Equine Disease Communication Center)

If your horse develops a fever, cough, nasal discharge, diarrhea, swollen lymph nodes, neurologic signs, poor appetite or sudden depression at a show, stop movement, isolate the horse and contact the event veterinarian or your own vet immediately.

Why Horse Shows Increase Disease Risk

Horse shows create three major disease advantages.

First, horses are mixing. They may stand in neighbouring stables, share warm up spaces, line up near each other, pass through wash bays, use shared laneways and travel beside unfamiliar horses.

Second, people are mixing. Riders, grooms, judges, stewards, farriers, vets, friends, children and curious spectators all move between horses. Hands, clothing, boots and equipment can move infectious material without anyone noticing.

Third, stress matters. Travel, competition, altered feeding, dehydration, long days, heat, dust and poor rest can make horses more vulnerable to illness or trigger reactivation of latent infections such as equine herpesvirus.

The California Department of Food and Agriculture notes that infectious disease agents at equine events may be spread by horses, people, vehicles, equipment, insects, ticks, birds, rodents, feed, waste and water. (Californian Food Department)

In practice, the risk is not usually one dramatic mistake.

It is ten small mistakes repeated all weekend.

A shared hose.
A communal water trough.
A borrowed twitch.
A horse allowed to sniff three others.
A fever ignored because “he always runs a little warm at shows.”

That is how show disease control falls apart.

What Diseases Can Spread at Horse Shows?

The main diseases of concern depend on country, region, season, event type and horse population, but the big categories are consistent.

Equine herpesvirus

Equine herpesvirus, especially EHV-1 and EHV-4, is a major concern at events. EHV-1 can cause respiratory disease, abortion and the neurologic form called equine herpesvirus myeloencephalopathy, or EHM. EHV-4 mainly causes respiratory disease, although it can rarely cause abortion or neurologic disease. EHV can spread through nasal secretions, close contact and contaminated surfaces, including people, clothing, feed, water, equipment and stalls. (Equine Disease Communication Center)

Vaccination helps reduce some disease risks, but it does not completely prevent infection or shedding. EDCC states that vaccines are available to help prevent the respiratory and abortive forms, but there is currently no vaccine labelled to prevent the neurologic form of EHV-1. (Equine Disease Communication Center)

Equine influenza

Equine influenza spreads rapidly through respiratory droplets and can move quickly through susceptible horse populations. It is especially important in travelling and competition horses because coughing, fever and nasal discharge can shut down training and spread through groups.

Vaccination reduces risk and severity, but no vaccine replaces early isolation and basic hygiene.

Strangles

Strangles is caused by Streptococcus equi subspecies equi. It spreads through nasal discharge, abscess drainage, shared buckets, contaminated hands, tack, grooming tools and carrier horses. It can cause fever, thick nasal discharge, swollen lymph nodes and abscesses. A recovered carrier horse can look normal while still harbouring bacteria in the guttural pouches.

This is one of the classic “the horse looked fine when it arrived” diseases.

Diarrhea causing infections

Salmonella, clostridial disease and other gastrointestinal infections can spread through manure contamination, dirty equipment, contaminated hands, shared cleaning tools, transport and poor hygiene.

A horse with fever and diarrhea at an event is not just messy. It may be infectious.

Ringworm and skin disease

Ringworm spreads through direct contact, brushes, rugs, saddle pads, tack, stable surfaces and hands. It is not usually life threatening, but it can spread widely and create a very annoying barn problem.

Regional high consequence diseases

Depending on location, other diseases may also matter. In Australia, for example, Hendra virus is a regional high consequence concern in relevant areas and should never be dismissed if a horse has serious respiratory or neurologic signs. Local veterinary and animal health authority advice should always guide risk.

A Real World Reminder: The 2011 Ogden EHV Outbreak

A major EHV-1 and EHM outbreak was linked to the National Cutting Horse Association Western National Championship event in Ogden, Utah, held from April 29 to May 8, 2011. USDA APHIS reported 90 confirmed EHV-1 or EHM cases across 10 states, including 57 confirmed EHV-1 cases, 33 confirmed EHM cases and 13 horses that died or were euthanised.

That outbreak is still worth talking about because it showed how quickly disease exposure at one event can become a multi state problem once horses travel home.

The lesson was not “never show horses again.”

The lesson was: event disease control depends on early detection, fast reporting, movement control, quarantine and cooperation.

That is less glamorous than a ribbon, but it protects the whole industry.

Horse Show Disease Risk Framework

Risk level	What it looks like	What it may mean	What to do
Low risk	Horse is bright, normal temperature, eating, no cough, no discharge, no known exposure	Routine show risk	Use standard biosecurity and monitor daily
Moderate risk	Recent travel, mild stress, neighbouring sick horses, dusty stabling, reduced appetite, mild nasal discharge	Early respiratory disease or stress related issue possible	Monitor temperature, limit contact, speak to your vet if signs persist
High risk	Fever, cough, thick nasal discharge, diarrhea, swollen lymph nodes, depression, known exposure	Contagious disease possible	Isolate immediately and contact the event vet
Critical	Neurologic signs, urine dribbling, severe weakness, respiratory distress, profuse diarrhea, collapse, multiple horses affected	Serious infectious disease or emergency condition possible	Stop movement and seek urgent veterinary care

The most important decision point is this: a fever at a show should never be ignored.

Not every fever is contagious, but every fever deserves investigation.

What Temperature Is a Fever in a Horse?

A commonly used fever threshold at equine events is over 101.5°F or 38.6°C. Pennsylvania’s equine event biosecurity recommendations state that temperatures should be taken 12 hours apart, not immediately after exercise or trailering, and before giving medications that may alter temperature, such as phenylbutazone or flunixin.

AAEP biosecurity guidance also recommends twice daily temperature logging at events and immediate reporting of temperatures over 101.5°F or 38.6°C to management.

That timing matters.

If you take a temperature straight after a round, after travel, or after giving anti inflammatories, you may misread the situation.

In practice, the best routine is:

Morning temperature before exercise.
Evening temperature when the horse has cooled down.
Same thermometer.
Same method.
Written record.

Very boring. Very useful.

Before the Show: What To Do in the Week Leading Up

1. Check your horse is genuinely healthy

In the 3 to 5 days before an event, monitor:

• Appetite
• Water intake
• Attitude
• Manure
• Coughing
• Nasal discharge
• Swelling under the jaw
• Limb swelling
• Any change in gait or behaviour
• Rectal temperature

NSW horse event biosecurity guidance recommends consciously monitoring horses in the days leading up to an event, including eating, drinking, behaviour, nasal discharge, coughing, discomfort, swelling and temperature. (NSW Department of Primary Industries)

If your horse has a fever, cough, thick discharge, diarrhea or unexplained dullness, do not go. Missing one show is much cheaper than being the person who turns the showground into a disease investigation.

2. Review vaccination status with your vet

Ask your vet which vaccines are appropriate for your horse based on:

• Region
• Travel frequency
• Show rules
• Age
• Pregnancy status
• Barn size
• Exposure to young horses
• Local disease alerts
• Previous vaccine history

For travelling horses, your vet may discuss vaccines for equine influenza and EHV, along with core vaccines and region specific risks. Vaccines reduce disease severity and spread risk, but they do not replace biosecurity.

3. Do not rely on vaccination alone

This is one of the biggest owner mistakes.

A vaccinated horse can still develop fever, respiratory signs or EHV related disease. EDCC states clearly that EHV vaccines do not completely prevent any form of the disease. (Equine Disease Communication Center)

Vaccination is one layer.

Biosecurity is another layer.

Monitoring is another layer.

The horse show disease plan works when all three are used together.

4. Pack personal gear only

Bring your own:

• Water buckets
• Feed tubs
• Hay nets
• Grooming tools
• Towels
• Thermometer
• Halter and lead rope
• Tack
• Saddle pads
• Muck fork
• Broom
• Wheelbarrow if practical
• Hose if possible
• Disinfectant and gloves
• Hand sanitiser
• Stall cleaning supplies

AAEP recommends that communal water sources should not be offered at events, exhibitors should use their own buckets, and equipment should not be shared.

Label everything. Horse shows have a magical ability to make identical buckets reproduce and migrate.

5. Clean the trailer before leaving

Before the show, remove manure, bedding and feed, then wash, dry and disinfect the trailer where appropriate.

AAEP recommends horse trailers and vans be cleaned and disinfected between uses, with mats removed where needed so floors can dry. (AAEP)

A trailer is not just transport. It is also a mobile stable, feed room, social club and sometimes microbiology experiment.

Do not let it become the last one.

At the Show: The Rules That Matter Most

1. Avoid nose to nose contact

This is one of the highest value rules.

No sniffing unfamiliar horses.
No grazing face to face.
No standing in tight lines with muzzles touching.
No “they just want to say hello.”

Respiratory diseases love social horses. Unfortunately, many horses have the social judgement of a Labrador at a barbecue.

CDFA biosecurity advice for equine events specifically recommends limiting horse to horse contact, especially nose to nose contact.

2. Do not share water

Do not use communal water troughs.

Do not let your horse drink from a shared bucket.

Do not dip a shared hose nozzle into your bucket.

AAEP states that hoses should not touch or submerge in water buckets while filling because of cross contamination risk.

This is a small habit that matters. The hose can become the disease delivery system everyone forgets about.

3. Use your own equipment

Do not share:

• Bits
• Bridles
• Halters
• Lead ropes
• Grooming tools
• Towels
• Buckets
• Thermometers
• Oral paste syringes
• Twitches
• Lip chains
• Rugs
• Saddle pads

The University of Missouri Veterinary Health Center advises bringing separate water buckets, feed tubs, hoses and stall cleaning equipment to events, and not putting this equipment back into general farm circulation when returning home. (MU Veterinary Health Center)

If gear must be shared, clean first, then disinfect, then allow proper contact time and drying.

4. Wash or sanitise hands frequently

Hands move disease between horses faster than owners realise.

Wash or sanitise:

• Before handling your horse
• After touching another horse
• After using shared surfaces
• After cleaning manure
• Before feeding
• Before touching the horse’s muzzle
• After helping another rider

Missouri’s event biosecurity guidance recommends frequent handwashing and 65 to 70 percent alcohol gel hand sanitiser at the stall area. (MU Veterinary Health Center)

5. Minimise people touching your horse

This includes well meaning strangers, children, friends from other barns and the person who says, “I’ve been around horses my whole life.”

Lovely. Still no.

The more hands on your horse’s face, muzzle, tack and feed equipment, the more pathways there are for disease.

6. Check temperature twice daily at multi day events

For multi day shows, check morning and evening.

Record:

• Time
• Temperature
• Appetite
• Water intake
• Coughing
• Nasal discharge
• Manure
• Attitude
• Any swelling
• Any gait change

The Pennsylvania event guidance states elevated temperature is often the first sign of infectious disease and recommends twice daily temperature monitoring at events.

This is one of the simplest ways to catch a problem before the whole barn knows about it.

What To Do If Your Horse Gets Sick at a Show

Step 1: Stop movement

Do not take the horse to the warm up arena.

Do not trailer home without veterinary guidance if an infectious disease is possible.

Do not walk around telling people, “He’s probably fine,” while the horse is actively not fine.

Step 2: Isolate the horse

Move the horse away from others if safe and directed by the event vet or organiser.

USAHA EHM incident guidance defines appropriate isolation as restricted access to other horses, with a minimum separation of 30 feet where possible, no shared equipment, barrier precautions and mandatory biosecurity protocols.

Step 3: Notify the event veterinarian or organiser

Do this early.

A sick horse at an event is not just your private problem. It can affect the entire venue.

Step 4: Take and record temperature

Take the temperature before anti inflammatory medication if possible, unless your veterinarian directs otherwise.

Medications like phenylbutazone and flunixin can suppress fever and make monitoring harder.

Step 5: Do not medicate blindly

Do not give leftover antibiotics, random anti inflammatories, sedatives or human medication without veterinary advice.

Medication can mask signs, complicate testing and delay proper control measures.

Step 6: Use separate equipment and handlers

Use dedicated buckets, tools and clothing for the sick horse.

Handle healthy horses first and sick horses last.

When Is This an Emergency?

Call a veterinarian immediately if your horse has:

• Fever over 101.5°F or 38.6°C
• Fever plus nasal discharge
• Fever plus cough
• Thick yellow or green nasal discharge
• Difficulty breathing
• Severe depression
• Sudden neurologic signs
• Weakness or wobbliness
• Urine dribbling
• Recumbency or difficulty rising
• Severe diarrhea
• Colic signs with fever
• Swollen lymph nodes under the jaw
• Abscess drainage
• Vesicles or sores around the mouth or coronary bands
• Multiple horses on the grounds showing similar signs

Missouri’s event biosecurity guidance says the event vet and manager should be notified if a horse develops fever, respiratory signs, neurologic symptoms, diarrhea or vesicular lesions at an equestrian event. (MU Veterinary Health Center)

With infectious disease, waiting for certainty is often the mistake.

You isolate based on suspicion.
You test based on veterinary assessment.
You release restrictions based on evidence.

What Else Can Cause Fever at a Show?

Not every fever at a show is infectious, but it should still be investigated.

Possible causes include:

• EHV
• Equine influenza
• Strangles
• Equine rhinitis virus
• Equine viral arteritis
• Pneumonia
• Diarrhea causing infections
• Cellulitis
• Hoof abscess
• Colic
• Heat stress
• Dehydration
• Reaction to medication or vaccination
• Transport stress with another underlying issue

Pennsylvania’s event guidance specifically notes that not all fevers are caused by infectious disease and that colic, cellulitis or abscesses can also cause fever, but all fevers should be investigated to determine the cause.

That is the clinical balance.

Do not panic over every elevated temperature.

Do not ignore one either.

After the Show: Protect the Home Barn

The post show period is where a lot of disease control fails.

The horse returns home.
Everyone relaxes.
The buckets go back into the feed room.
The horse goes straight back with broodmares, foals or seniors.
Three days later, someone coughs.

Routine return from a low risk event

For lower risk events with no known illness, monitor closely for at least 14 days.

EDCC recommends new and returning horses be kept separate and monitored for at least 14 days, with twice daily temperature checks and health checks that include appetite, water intake, urination, manure and signs of illness. (Equine Disease Communication Center)

Return from a high risk event or known exposure

If there was a sick horse at the event, an EHV alert, a strangles exposure, fever on site, poor biosecurity or direct contact with unknown horses, use stricter separation and speak to your vet.

For EHV or EHM linked exposure, guidance may involve 14 to 21 days or longer depending on the risk category, testing and local animal health authority requirements. USAHA EHM guidance describes a 21 day monitoring period for index or high risk premises and a 14 day monitoring period for other exposed premises.

Separate from high risk horses

Be extra careful around:

• Pregnant mares
• Foals
• Weanlings
• Older horses
• Horses recovering from illness
• Horses with immune compromise
• Horses that do not travel
• Valuable breeding or competition groups

A returning show horse may look perfectly normal and still be incubating something.

Normal is reassuring. It is not proof.

How To Set Up Post Show Separation

A practical post show setup includes:

• Separate stable or paddock
• No direct nose to nose contact
• Separate water and feed equipment
• Separate grooming tools
• Separate mucking tools
• Handle returning horses last
• Wash hands before and after handling
• Change boots or use boot hygiene
• No shared rugs, tack or towels
• Temperature log morning and evening
• Record appetite, cough, discharge, manure and attitude

Missouri guidance suggests separating returning horses from resident horses when needed, with a distance of about 35 feet maintained from the resident population. (MU Veterinary Health Center)

If your facility cannot do perfect separation, do the best available version. A partial barrier is still better than immediate mixing.

Cleaning and Disinfection: The Step Owners Skip

Disinfectant does not work properly through manure, dirt, bedding, mucus and feed slime.

Clean first.
Then disinfect.

CDFA event biosecurity guidance explains that alcohol and bleach can be inactivated by organic matter such as soil and manure, and recommends removing organic matter, washing with soap and water, drying, then applying disinfectant according to label directions.

AAEP also recommends cleaning equipment of organic matter, scrubbing with detergent and water, rinsing, drying and disinfecting shared equipment.

Clean and disinfect:

• Trailer floors and walls
• Ramp
• Mats
• Buckets
• Feed tubs
• Hay nets
• Grooming tools
• Muck forks
• Wheelbarrow handles and wheels
• Boots
• Tack where safe and appropriate
• Stable surfaces if used
• Water hoses and nozzles if possible

The four step rule is:

1. Remove organic matter.

2. Wash with detergent and water.

3. Rinse and dry.

4. Apply disinfectant for the correct contact time.

Skipping straight to spray bottle theatre is not biosecurity. It is perfume for germs.

Horse Show Biosecurity Checklist

Before leaving home

• Confirm vaccination plan with your vet
• Check event health requirements
• Monitor temperature for several days before travel
• Do not travel a sick horse
• Pack your own buckets, feed tubs and gear
• Pack a dedicated thermometer
• Clean and disinfect trailer
• Bring hand sanitiser and gloves
• Label all equipment
• Plan post show separation before you leave

At the show

• Avoid nose to nose contact
• Do not share water
• Do not use communal troughs
• Keep hose nozzles out of buckets
• Use your own tack and grooming gear
• Limit other people touching your horse
• Wash hands often
• Check temperature twice daily at multi day events
• Avoid tying to shared fencing
• Avoid busy manure and waste areas
• Report fever or illness early

Before leaving the show

• Clean obvious manure and dirt from gear
• Keep show equipment separate from home equipment
• Note any known sick horses or disease alerts
• Record your horse’s temperature
• Travel directly home where possible

After returning home

• Separate returning horses for at least 14 days where practical
• Use stricter monitoring after high risk events or known exposure
• Take temperatures twice daily
• Handle returning horses last
• Use separate equipment
• Clean and disinfect trailer and gear
• Watch for cough, nasal discharge, diarrhea, swelling or dullness
• Call your vet if anything changes

Common Mistakes at Horse Shows

Mistake 1: Letting horses “say hello”

Nose to nose contact is one of the easiest ways to spread respiratory disease.

Mistake 2: Sharing buckets or hoses

Water equipment is a major overlooked risk. Hoses should not touch or submerge in buckets while filling.

Mistake 3: Skipping temperature checks

Fever can be the first sign of infectious disease. Waiting for coughing or discharge can mean losing the early isolation window.

Mistake 4: Giving medication before checking temperature

Anti inflammatory drugs can mask fever, making it harder to identify infectious disease early.

Mistake 5: Putting returning horses straight back with the herd

Returning horses should be monitored and separated when practical, especially if the home property has broodmares, foals or high value competition horses. (Equine Disease Communication Center)

Mistake 6: Thinking vaccination replaces biosecurity

Vaccines help, but they do not completely prevent diseases such as EHV, and no EHV vaccine is labelled to prevent EHM. (Equine Disease Communication Center)

Mistake 7: Spraying disinfectant onto dirty gear

Organic matter reduces disinfectant effectiveness. Clean first, then disinfect.

Myth vs Reality

Myth	Reality
“My horse is vaccinated, so we are safe.”	Vaccination reduces risk and severity, but it does not replace biosecurity.
“A small fever after travel is normal.”	It may be stress related, but fever at a show still needs monitoring and veterinary judgement.
“Only sick looking horses spread disease.”	Some infections can be early, mild or subtle before obvious signs appear.
“Borrowing a bucket once does not matter.”	Shared buckets, hoses and feed tubs can spread infectious material.
“Post show separation is overkill.”	Many diseases have incubation periods. Monitoring returning horses protects the home herd.
“Disinfectant spray fixes everything.”	Disinfectant works best after organic material is removed and the correct contact time is followed.

Frequently Asked Questions

Should I take my horse’s temperature at a show?

Yes, especially at multi day events or high risk venues. Twice daily temperature checks are one of the best early warning tools because fever can appear before obvious coughing, nasal discharge or neurologic signs.

Can my vaccinated horse still catch disease at a show?

Yes. Vaccination helps reduce risk and disease severity, but it does not block every infection. This is especially important with EHV, where vaccines do not completely prevent disease and no vaccine is labelled to prevent EHM. (Equine Disease Communication Center)

How long should I isolate my horse after a show?

For routine lower risk returns, monitor and separate for at least 14 days where practical. If there was known exposure, fever, EHV concern or an outbreak linked to the event, follow your veterinarian and animal health authority guidance, which may require stricter quarantine and monitoring. (Equine Disease Communication Center)

Can I use communal water at a show?

Avoid communal water troughs and shared buckets. Use your own bucket, and do not allow hose nozzles to touch or sit inside the bucket water. AAEP specifically recommends against communal water sources at events and warns against hose contact with water buckets.

What should I do if another horse at the show is coughing?

Keep your horse away from that horse, avoid shared spaces and equipment, monitor your horse’s temperature, and ask the event organiser or veterinarian whether any disease investigation is underway. If your horse develops fever, cough, discharge or dullness, isolate and call your vet.

The Bottom Line

Showing horses should be fun, but disease protection has to be part of the routine.

The best biosecurity is not dramatic. It is simple, repetitive and slightly boring: take temperatures, bring your own gear, avoid shared water, stop nose to nose contact, wash hands, clean trailers, separate returning horses and act fast when a horse looks unwell.

The horses that create outbreaks are not always the obviously sick ones.

Sometimes it starts with one fever.
One shared bucket.
One horse that “probably just travelled badly.”
One decision to keep competing instead of reporting.

A good show plan protects your horse, your barn, the event and every other horse that has to go home safely.

If your horse is bright, eating, drinking and temperature normal, enjoy the show and keep the routine tight.

If your horse develops fever, cough, discharge, diarrhea, swelling, depression or neurologic signs, stop, isolate and call the vet. That decision is not overreacting. It is responsible horsemanship.

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If you are unsure whether your horse’s show related fever, cough, nasal discharge, diarrhea or exposure risk needs isolation or urgent care, ASK A VET™ can help you organise the signs, track temperatures and decide when veterinary advice should not wait.