Dietary Tips for Hauling Horses: Feeding, Hydration and Colic Prevention

By Dr Duncan Houston

Hauling can look simple from the outside: load the horse, drive carefully, arrive safely. The horse’s gut, however, may have other opinions.

Transport can reduce drinking, increase sweating, expose the horse to heat, dust and stress, and disrupt normal feeding patterns. That combination can increase the risk of dehydration, poor appetite, impaction colic, gastric irritation, heat stress and reduced performance after arrival.

The best travel feeding plan is not complicated. It is built around consistency, water, forage, ventilation, rest stops, and not suddenly becoming a nutrition scientist on the morning of the trip.

Quick Answer

When hauling horses, keep the diet as consistent as possible, bring familiar feed and hay, offer clean water regularly, avoid sudden supplement or feed changes, and use soaked or low-dust hay where appropriate. During longer trips, offer water every 3 to 6 hours, more often in hot weather or if the horse is sweating. If your horse develops colic signs, fever, depression, poor appetite, laboured breathing, severe dehydration or refuses to drink after travel, call your vet promptly. UC Davis recommends offering water every 4 to 6 hours, or every 3 to 4 hours in hot weather, and planning regular checks during transport.

Why Feeding and Hydration Matter During Hauling

Travel changes the normal rhythm of a horse’s digestive system.

At home, most horses move around, graze, drink from familiar water sources, pass manure normally, and eat in predictable patterns. In a trailer, they may stand braced for hours, drink less, eat differently, inhale more dust, sweat more, and become stressed.

That matters because horses are designed for frequent forage intake and steady hydration. Reduced water intake can dry out gut contents, slow intestinal movement and increase the risk of impaction colic. University of Minnesota Extension notes that water intake helps maintain fecal moisture, and when fecal material becomes too dry, intestinal blockage or impaction can occur. (extension.umn.edu)

The real goal is not to “boost” your horse with clever products before travel. It is to keep the gut boringly stable. Boring is excellent. Boring gets horses to the event without a veterinary bill that ruins the weekend.

What Can Go Wrong on the Road?

Travel related digestive problems usually come from a few predictable issues.

Problem	Why it happens	Why it matters
Dehydration	Reduced drinking, sweating, heat, dry feed	Increases risk of impaction colic and poor recovery
Reduced appetite	Stress, unfamiliar surroundings, different feed	Can worsen gastric irritation and reduce performance
Sudden diet change	New hay, grain, supplements or water	Can upset hindgut function
Dust exposure	Dry hay, poor ventilation, high hay nets	Can irritate airways and increase respiratory risk
Heat stress	Hot trailer, humidity, poor airflow, long delays	Can cause dehydration, weakness and collapse
Shipping fever	Long travel, head restraint, dust, stress, poor lung clearance	Can cause fever, depression, poor appetite and pneumonia

Merck Veterinary Manual notes that pleuropneumonia, often called shipping fever, is more likely after long-distance transport with head restraint because lung defence mechanisms can be impaired. Signs can include fever, depression, lethargy, poor appetite, shallow breathing and nasal discharge. (Merck Veterinary Manual)

The Golden Rule: Do Not Change the Diet on Travel Day

This is the biggest nutrition mistake.

Do not suddenly introduce:

• New grain

• New hay

• New supplements

• New oils

• New electrolytes

• New probiotics

• New water flavouring

• New mashes

• New treats in large amounts

A horse’s hindgut microbial population likes routine. Sudden feed changes can disrupt fermentation and increase the chance of gas, loose manure, reduced appetite or colic.

Bring enough of your horse’s normal feed, hay and supplements for the full trip, plus extra. If the event runs late, the weather changes, or you get delayed, you do not want to be hunting for “something similar” at a random feed store while your horse’s gut files a complaint.

Before You Leave: The Travel Feeding Plan

Keep the Last 7 Days Predictable

The week before travel is not the time to overhaul the ration. Keep the horse on its normal forage, concentrate, salt and supplement routine.

If you want to use a probiotic, electrolyte, soaked feed, flavoured water or travel mash, trial it at home first. A horse that refuses a new flavour in the stable is unlikely to suddenly become adventurous in a service station parking area.

Check Drinking Before the Trip

Make sure your horse is drinking normally in the days leading up to travel. UC Davis specifically recommends checking that a horse has been drinking normally before transport and notes that excessive or uncontrolled electrolyte administration may adversely affect water and electrolyte balance.

That does not mean electrolytes are bad. It means they should be used thoughtfully.

Do Not Overload Grain Before Loading

Avoid giving a large grain meal immediately before hauling. If your horse normally receives concentrate, keep the schedule familiar, but consider smaller, sensible meals around travel rather than one big bucket before loading.

Forage is usually the more important travel feed. Grain is not the hero here. Hay is the quiet accountant keeping the gut paperwork in order.

Pack More Than You Think You Need

For longer trips, pack:

• Normal hay

• Normal concentrate

• Normal supplements

• Salt or electrolyte products already used at home

• Water buckets

• A familiar water source if your horse is picky

• Enough feed for delays

• A small amount of soaked feed only if the horse is used to it

• Cleaning gear for buckets and feed tubs

UC Davis advises bringing sufficient feed and water and planning the route so horses can be checked and offered water regularly.

Water: The Most Important Travel Nutrient

Hydration is the foundation of safe hauling.

An adult horse at rest in a cool climate may drink around 6 to 10 gallons of water daily, and water needs increase with heat, work and sweating. University of Minnesota Extension advises free access to clean, cool water and notes that horses drink much more while working or in hot conditions. (extension.umn.edu)

During hauling, many horses drink less than they would at home. That may be because of stress, trailer movement, unfamiliar water, timing, temperature or simple stubborn horse behaviour.

How Often Should You Offer Water?

For longer journeys, offer water every 3 to 6 hours. In hot weather, high humidity or if the horse is sweating, offer it more often. UC Davis recommends clean water every 3 to 6 hours during prolonged transport and more frequent offering in warm, humid conditions or when horses are sweating.

For hot conditions, aim closer to every 3 to 4 hours.

Should You Bring Water From Home?

For picky drinkers, yes, if practical. Some horses are reluctant to drink unfamiliar water. UC Davis notes that bringing water from home may help because some horses refuse water from unfamiliar sources.

Another option is to train the horse to accept a familiar flavour in water before travel. The key phrase is before travel. Do not invent a strawberry-water situation on the side of the road and expect gratitude.

Should You Flavour Water?

Flavouring can help some horses, but only if they have already accepted it at home.

Options sometimes used include:

• A small amount of soaked feed water

• A familiar electrolyte flavour

• Peppermint flavouring

• Apple flavouring

• A small amount of molasses, if appropriate for that horse

Always offer plain water as well. University of Minnesota Extension advises that if electrolytes are added to drinking water, plain water should also be offered because some horses dislike the taste and may drink less. (extension.umn.edu)

Hay During Transport: Yes, But Be Smart

For most horses, forage during travel is helpful because it supports normal gut movement, helps buffer stomach acid and gives the horse something familiar to do.

However, hay can also increase dust exposure, especially if the hay net sits high and close to the muzzle. UC Davis recommends that hay fed during transport should be as dust free as possible and says hay may be thoroughly soaked before being loaded or fed in a net.

A University of Florida transport document also notes that hay during transport can help with ulcer prevention, gastrointestinal movement and boredom, while wet hay can reduce particle inhalation and add water intake. It also warns that horses should be acclimated to wet hay before transport. (extadmin.ifas.ufl.edu)

Best Hay Practices for Hauling

Use:

• The horse’s normal hay

• Clean hay

• Low-dust hay

• Soaked hay if the horse is used to it

• A safe hay net height

• Small-hole nets if appropriate and safe

Avoid:

• Moldy hay

• Very dusty hay

• New hay types

• Hay the horse refuses

• Hay nets positioned so high they shower dust into the nostrils

• Nets low enough for hoof entanglement

The sweet spot is simple: forage available, dust reduced, head and airway safety respected.

Head Position, Hay Nets and Respiratory Health

This is where feeding and respiratory health overlap.

Horses clear mucus, dust and debris from the airway more effectively when they can lower the head. Long periods with the head restrained high can reduce airway clearance and increase respiratory risk.

UC Davis states that horses should have as much freedom of head movement as safely possible, and that prolonged head-up restraint may compromise lung clearance and predispose horses to shipping fever. It also recommends placing hay nets as low as possible while preventing foot entanglement.

Practical translation: do not tie the horse so tightly that it cannot move its head, eat comfortably or clear its airway. Safe restraint matters, but so does breathing.

Electrolytes: Useful, But Not Magic

Electrolytes can help horses that sweat heavily, travel in heat, compete after arrival, or have a known dehydration risk. They should not be used randomly, excessively or for the first time on travel day.

University of Minnesota Extension recommends considering electrolytes for horses that have been sweating heavily or are expected to sweat, but also advises offering plain water if electrolytes are added to drinking water. (extension.umn.edu)

UC Davis is more cautious for routine transport and notes that excessive or uncontrolled electrolyte use may adversely affect water and electrolyte balance unless a horse has a history of dehydration.

The practical rule:

• If electrolytes are part of your horse’s normal program, continue sensibly.

• If your horse will sweat heavily, discuss timing and dose with your vet.

• Always provide plain water.

• Do not syringe large amounts of electrolytes into a horse that is not drinking unless your vet directs it.

Electrolytes without water are like giving someone salt chips in the desert and calling it hydration. Very bold. Very incorrect.

Probiotics and Gut Supplements

Probiotics and digestive supplements may have a place for some horses, especially those with a history of loose manure, stress-related digestive upset or travel appetite changes.

But they are not emergency armour.

The most important rule is the same: do not start them on travel day. Introduce any gut supplement at home, monitor appetite and manure, and only travel with it if the horse tolerates it well.

For a horse with a history of colic, ulcers, chronic diarrhea, poor appetite during travel or major competition stress, speak with your vet before the trip. The plan may involve more than a probiotic label and hope.

Medications Before Hauling

Do not give last-minute medication unless it is part of a veterinary plan.

This includes:

• Sedatives

• NSAIDs

• Ulcer medication

• Anti-diarrheal medication

• Antibiotics

• Diuretics

• Extra electrolytes

• Random “calming” products

Sedation may be appropriate in selected horses, but it can affect balance, sweating, temperature regulation and safety. UC Davis notes that tranquilisation may assist loading and handling in some cases, but medication can interfere with temperature regulation and should be used cautiously.

If your horse needs medication, ask your vet:

• Should it be given before travel, after arrival, or not at all?

• Could it affect drinking, sweating, temperature or gut motility?

• Could it mask signs of colic or illness?

• Is it competition legal?

• What signs would mean the medication is causing a problem?

During the Haul: What To Feed and Monitor

During the trip, keep it simple.

Offer Forage

Provide familiar, clean, low-dust hay if safe. Soaked hay can help reduce dust and increase moisture intake, but only if your horse already eats it well.

Offer Water at Planned Stops

Offer water regularly from a bucket. Give the horse time. Some will drink immediately, others need a few quiet minutes.

Check Manure and Urine

At stops, look for:

• Has the horse passed manure?

• Is manure dry, scant, loose or normal?

• Has the horse urinated?

• Is the horse sweating excessively?

• Is the bedding soaked with urine or manure?

• Is the horse standing normally?

UC Davis recommends planning regular checks and, where possible, removing manure and urine at similar intervals to water stops.

Avoid Long Stationary Delays

A parked trailer in the sun can become dangerously hot. UC Davis warns that a trailer in the sun can be more than 20 degrees warmer inside than outside, and recommends avoiding prolonged stationary periods in traffic or refuelling stops.

If you get stuck, think ventilation, shade, airflow, water and whether unloading is safe.

After Arrival: Do Not Rush the Gut

Arrival is not the finish line for risk. Many transport problems show up after the horse unloads.

On arrival:

1. Unload calmly.

2. Offer clean water.

3. Let the horse lower its head.

4. Offer familiar hay.

5. Hand walk if appropriate.

6. Check temperature.

7. Check respiratory effort.

8. Check manure and urine.

9. Delay heavy grain meals if the horse is stressed or not drinking.

10. Monitor closely for 24 to 72 hours after long hauls.

UC Davis notes that horses travelling well should arrive bright, alert and with normal rectal temperature, while water and hay are offered on arrival and dehydration often corrects within hours once clean water is available.

For long trips, UC Davis recommends that road transport time per day should not exceed 12 hours from the time the first horse is loaded, followed by removal from the vehicle and at least 8 hours of comfortable stabling to allow tracheal clearance and rehydration.

How Worried Should You Be?

Low Risk

This is usually lower risk if the horse:

• Travels less than a few hours

• Eats normally

• Drinks when offered

• Arrives bright and relaxed

• Has normal manure

• Has normal temperature

• Has no cough, nasal discharge or colic signs

What to do: keep feed familiar, offer water, monitor for the rest of the day.

Moderate Risk

This is more concerning if the horse:

• Drinks poorly during the trip

• Has reduced manure output

• Seems tucked up or mildly dehydrated

• Has mild loose manure

• Is quieter than usual

• Refuses some feed after arrival

• Has travelled in hot or humid conditions

What to do: monitor closely, offer water and familiar forage, check temperature, and call your vet if signs persist, worsen or combine with pain, fever or depression.

High Risk

This is high risk if the horse:

• Refuses water for many hours

• Stops passing manure

• Shows colic signs

• Has a fever

• Is depressed or off feed

• Has nasal discharge or cough

• Breathes harder than normal

• Sweats excessively

• Has dark gums, dry gums or prolonged skin tent

• Has travelled a long distance with limited rest

What to do: contact your vet. Do not assume it is just travel tiredness.

Critical

This is an emergency if the horse:

• Is repeatedly lying down or rolling

• Has severe abdominal pain

• Has laboured breathing

• Has a high fever

• Is weak, collapsed or uncoordinated

• Has signs of heat stroke

• Has profuse diarrhea

• Has severe dehydration

• Has foul nasal discharge, chest pain signs or marked depression after travel

What to do: seek urgent veterinary care.

When Is This an Emergency?

Call your vet urgently if your horse shows any of the following after hauling:

• Colic signs

• Repeated pawing, flank watching, rolling or lying down

• No manure after a long trip with poor appetite

• Refusal to drink combined with depression or dry gums

• Fever

• Cough

• Nasal discharge

• Poor appetite after long-distance travel

• Laboured or rapid breathing

• Heat stress signs

• Severe sweating or inability to cool down

• Depression, weakness or collapse

• Diarrhea with dullness or dehydration

University of Minnesota Extension advises contacting a veterinarian right away if a horse stops producing sweat, breathes heavily, or becomes lethargic, distressed or uncoordinated in hot conditions. (extension.umn.edu)

Shipping fever is another major post-travel concern. Merck lists fever, depression, lethargy, poor appetite, shallow breathing, chest pain signs and foul-smelling nasal discharge as possible signs of pleuropneumonia. (Merck Veterinary Manual)

What Else Can Look Like “Travel Gut Upset”?

A horse that is quiet, not eating or uncomfortable after travel may have more than simple stress.

Important rule-outs include:

• Impaction colic

• Gas colic

• Gastric ulcers

• Dehydration

• Heat stress

• Exhaustion

• Shipping fever

• Respiratory virus

• Choke

• Diarrhea from diet change

• Salmonella or infectious diarrhea

• Tying-up

• Pain from injury during transport

• Laminitis in high-risk horses

• Medication reaction

• Stress-related poor appetite

This is why the whole horse matters. Appetite, manure, water intake, temperature, breathing, gum moisture, attitude and pain signs all need to be read together.

What To Do Right Now Before a Trip

Use this checklist before hauling:

1. Keep the diet unchanged for at least several days before travel.

2. Pack familiar hay, feed and supplements.

3. Bring more feed than the trip should require.

4. Check that the horse is drinking normally.

5. Trial any water flavouring before the trip.

6. Do not start a new probiotic, electrolyte or supplement on travel day.

7. Use clean, low-dust hay.

8. Consider soaked hay only if the horse is already used to it.

9. Plan water stops every 3 to 6 hours, more often in heat.

10. Avoid hauling during the hottest part of the day where possible.

11. Make sure the trailer is well ventilated.

12. Allow safe head movement.

13. Have veterinary contacts along the route for long trips.

14. Check temperature, appetite, water intake and manure after arrival.

UC Davis recommends avoiding extremes of heat and cold, planning routes to stop regularly, offering water, and locating veterinarians along the way for emergencies during transit.

Common Mistakes Owners Make

Changing Feed at the Destination

Using whatever hay or grain is available can trigger digestive upset. Bring your own.

Starting Electrolytes on Travel Day

Some horses refuse electrolyte-flavoured water. Always test first and provide plain water.

Offering Only Dry Hay on a Hot Long Trip

Dry hay plus poor drinking can increase dehydration risk. Low-dust or soaked hay may help in the right horse.

Tying the Head Too High

Safe restraint is important, but prolonged head-up restraint can reduce airway clearance and increase shipping fever risk.

Skipping Water Stops Because the Horse “Never Drinks Anyway”

Offer water anyway. Quiet time, familiar buckets and familiar water can make a difference.

Feeding a Big Grain Meal After Arrival

A stressed, dehydrated horse with reduced gut movement does not need a victory bucket of grain. Start with water, forage and calm monitoring.

Ignoring Subtle Post-Travel Signs

A horse that is dull, off feed or mildly febrile after hauling may be developing something serious. Check temperature rather than guessing.

Special Cases That Need Extra Planning

Horses With Previous Colic

These horses need a proper travel plan. Discuss forage, water, electrolytes, stop frequency, medications and arrival monitoring with your vet before leaving.

Horses With Gastric Ulcers

Long gaps without forage can worsen gastric discomfort. Travel plans often focus on consistent forage access and reducing stress.

Horses That Do Not Drink Away From Home

Train this at home. Use familiar buckets, bring home water where possible, and trial flavouring before the trip.

Horses Travelling in Hot Weather

Travel during cooler hours, increase water stops, maximise ventilation and avoid parking in direct sun with horses inside. University of Minnesota Extension specifically recommends transporting during the coolest part of the day, using well-ventilated trailers and offering water often. (extension.umn.edu)

Young, Old or Unfit Horses

These horses may be less resilient to heat, dehydration and transport stress. Plan shorter legs, more rest and more careful monitoring.

Competition Horses

Do not assume arrival means performance readiness. Long travel can affect hydration, weight, appetite and energy. UC Davis notes that weight loss during transport can reflect reduced intake, dehydration, manure and urine loss, and sweating, with horses travelling more than 12 hours found to lose up to 5% of body weight.

Can Travel-Related Colic Be Prevented?

Not every case can be prevented, but risk can be reduced.

Practical prevention includes:

• Keep feed consistent

• Maintain forage intake

• Offer water regularly

• Bring familiar water for picky drinkers

• Avoid sudden supplements

• Use low-dust or soaked hay where appropriate

• Keep the trailer ventilated

• Avoid excessive heat

• Plan rest stops

• Allow safe head movement

• Monitor manure after arrival

• Do not rush into hard work immediately after long travel

• Call early if appetite, manure, water intake or attitude are abnormal

The key is to prevent the classic travel combination: dry feed, low water intake, stress, heat, dust and delayed monitoring.

Will My Horse Be Okay After Hauling?

Most horses travel well when the trip is planned properly. A bright horse that drinks, eats familiar hay, passes manure, has a normal temperature and settles after arrival is usually low concern.

The outlook becomes more guarded when the horse arrives dull, dehydrated, febrile, off feed, colicky, coughing or breathing harder than normal.

The main decision point is simple: travel tiredness should improve with rest, water and familiar forage. A horse that worsens, develops fever, shows pain, stops eating or breathes abnormally needs veterinary attention.

FAQs

Should horses have hay while being hauled?

Usually yes, especially on longer trips, but the hay should be familiar, clean and low dust. Soaked hay may help reduce dust and add moisture if the horse is used to eating it.

How often should I offer water during hauling?

For longer trips, offer water every 3 to 6 hours. In hot weather, high humidity or if the horse is sweating, offer water more often.

Should I give electrolytes before hauling?

Electrolytes may be useful for horses that sweat heavily or have a known need, but they should not be started suddenly on travel day. If electrolytes are added to water, always provide plain water too.

Can hauling cause colic?

Yes, hauling can contribute to colic risk, especially when horses drink less, eat differently, become stressed, sweat heavily or have reduced gut movement. Poor hydration is a key risk for impaction.

What should I feed after arrival?

Start with clean water and familiar forage. Avoid a large grain meal immediately after arrival if the horse is stressed, dehydrated, off feed or has not passed manure normally.

Final Thoughts

The best hauling diet is not fancy. It is familiar.

Keep the horse’s feed routine steady, prioritise water, use clean low-dust forage, avoid sudden supplements, plan stops, and monitor closely after arrival. Most travel nutrition problems come from trying something new, skipping water planning, ignoring heat, or assuming a quiet horse is just tired.

A smooth trip starts before the trailer leaves. Pack the normal feed, bring the familiar hay, train the water strategy at home, and let boring win.

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If your horse has a history of colic, poor drinking, ulcers, travel stress, or appetite changes after hauling, ASK A VET™ can help you understand what to monitor and what questions to ask your treating vet before your next trip.