Aquatic Therapy for Horses: Benefits, Risks and When It Helps

Aquatic therapy can be useful for rehabilitation and conditioning, but the water depth, speed, horse, injury, and timing all matter.

By Dr Duncan Houston

Aquatic therapy has become increasingly popular in equine rehabilitation. Water treadmills, swimming pools, spas, and cold-water therapy are now used in performance yards, rehab centres, referral hospitals, and training programs.

The appeal is obvious. Water can reduce impact, add resistance, encourage range of motion, and allow controlled exercise without a rider. For some horses, that can be extremely useful.

But water therapy is not automatically safe, and it is not appropriate for every injury. A horse with an acute tendon lesion, a healing wound, neurological weakness, back pain, poor coordination, skin disease, or recent joint injection may need a very different plan from a fit sport horse using a water treadmill for cross-training.

The best use of aquatic therapy is not “put the horse in water and hope.” It is a targeted rehabilitation or conditioning tool with a clear goal, a veterinary diagnosis, and a carefully adjusted protocol.

Quick Answer

Aquatic therapy can help selected horses by reducing concussive loading, increasing limb range of motion, improving controlled movement, supporting conditioning, and helping some rehabilitation programs. Water treadmill exercise is generally more controllable than swimming because the horse remains walking or trotting with limb contact, while water depth and speed can be adjusted to target different movement patterns. The evidence is promising but still incomplete, and expert consensus notes there is still much to learn about optimal protocols for individual horses, injuries, and training goals. (MDPI)

What Is Aquatic Therapy for Horses?

Aquatic therapy means using water as part of a horse’s rehabilitation, conditioning, recovery, or pain management plan.

It may include:

• Water treadmill exercise

• Swimming

• Cold water spa therapy

• Warm water therapy

• Hydrotherapy for swelling or inflammation

• Controlled water walking

• Post-injury conditioning support

UC Davis explains that water makes muscles work harder than land exercise, while buoyancy reduces weight-bearing on bones, joints, and soft tissues. The pressure of water can also help reduce swelling and inflammation.

That combination is the whole reason aquatic therapy is attractive: less impact, more resistance, and controlled movement.

The challenge is that every variable matters.

Water depth matters.

Speed matters.

Duration matters.

Frequency matters.

The horse’s injury matters.

The horse’s behaviour matters.

The facility’s safety and water management matter.

That is why aquatic therapy should be prescribed like rehab, not sold like a spa day.

Water Treadmill vs Swimming vs Spa Therapy

These are not the same thing.

Therapy type	Best use	Main caution
Water treadmill	Controlled walking or trotting, range of motion, low-impact conditioning, rehab progression	Wrong water depth or speed can alter movement in unhelpful ways
Swimming	Cardiovascular conditioning without limb ground impact	Less controlled, unnatural posture, possible stress, not ideal for many rehab cases
Cold water spa	Swelling, inflammation, lower limb recovery in selected cases	Does not replace diagnosis or structured rehab
Warm water therapy	Muscle relaxation or selected chronic stiffness cases	Not for acute inflammation unless vet-directed

Water treadmills are often preferred for rehabilitation because the horse can move in a more controlled, straight, repeatable pattern. Swimming may help conditioning in some horses, but it changes movement dramatically. UC Davis notes that horses are not natural swimmers, tend to use the front limbs for balance and the hind limbs for propulsion, and may adopt an inverted posture, especially when entering the water. Speed and intensity are also difficult to modify in swimming pools.

The Horse similarly reports that swimming can involve high head carriage, back extension, no ground contact, and forceful hind limb movement, and that water pressure on the chest can create respiratory stress in some horses. (The Horse)

So the practical rule is simple:

Swimming may suit conditioning in selected horses. Water treadmills are usually easier to control for rehabilitation.

How Does a Water Treadmill Work?

A water treadmill lets the horse walk or trot on a moving belt inside a chamber filled to a chosen water depth.

The water changes the work in three main ways.

Buoyancy Reduces Load

Higher water increases buoyancy, which reduces the effective load through the limbs. This can be useful when a horse needs controlled movement without full concussive loading.

Drag Increases Effort

The horse must move the limbs through water. That resistance can increase muscle work without needing speed, jumping, hills, or rider weight.

Water Depth Changes Movement

Different water depths change how the horse uses the limbs, back, and pelvis. A study of horses walking on a water treadmill found that increasing water depth significantly increased carpal and tarsal flexion, thoracic spine flexion-extension range of motion, and pelvic movement variables. The authors concluded that even modest water-depth changes can significantly affect limb, back, and pelvic movement, which matters for program design. (Hartpury University)

This means water depth is not a random setting.

A fetlock-depth session and a stifle-depth session are not the same exercise.

What Does the Research Show?

The short version: aquatic therapy is promising, but the science is still developing.

Consensus guidelines for equine water treadmills state that water treadmill exercise can be a useful addition to training and rehabilitation programs when the chosen protocol creates adaptations that match the horse’s goal. The same paper states there is still much to learn about optimal use for individual horses. (MDPI)

The research also shows that protocols vary widely. A survey of 41 water treadmill venues found session durations from 5 to 54 minutes, walking speeds from 0.7 to 3.0 m/s, and trot speeds from 3.0 to 5.0 m/s. The authors cautioned that current practice does not automatically equal best practice, especially because high water and high speed can challenge an unprepared horse or potentially worsen an acute tendon injury. (MDPI)

A 2024 longitudinal observational study of 48 sport horses found that regular water treadmill use was associated with changes in gait characteristics over 20 and 40 weeks. The responses were mainly affected by water depth, but previous experience, session frequency, and the speed and depth used in training also influenced adaptation. (MDPI)

UC Davis gives the balanced conclusion well: swimming pools, underwater treadmills, and spas have potential benefits, but more scientific studies are needed to document outcomes and inform guidelines and regulations.

So yes, aquatic therapy has value.

No, it is not fully standardised.

And no, every facility protocol should not be accepted just because there is water involved.

Potential Benefits of Aquatic Therapy

Aquatic therapy may help selected horses with:

• Low-impact conditioning

• Controlled straight-line movement

• Increased joint range of motion

• Improved core and muscle strength

• Reduced concussion during rehabilitation

• Return-to-work progression after injury

• Cross-training for sport horses

• Maintaining fitness when ridden work is limited

• Supporting some arthritis or stiffness management plans

• Reconditioning after stall rest

British Equestrian’s water treadmill guidance describes potential benefits including increased lower limb range of movement, increased lumbar flexion, decreased impact shock, and cross-training in a controlled environment.

UC Davis also notes that underwater treadmill exercise is associated with improved muscle and core strength and increased joint range of motion, with water depth influencing which joints show greater range of motion. It also reports that impact shock is reduced as water depth increases, with about a 30% reduction when water is at stifle level.

The important phrase is may help selected horses.

Aquatic therapy is not a cure. It is a tool.

When Aquatic Therapy May Be Useful

Aquatic therapy may be useful in a vet-guided plan for:

Osteoarthritis

Water treadmill exercise may help some arthritic horses move with less concussive loading while maintaining joint motion, strength, and controlled activity.

It should not replace diagnosis, weight control, farriery, medication when needed, or workload management.

Tendon and Ligament Rehabilitation

Aquatic therapy may be useful later in tendon or ligament rehab when controlled straight-line movement is appropriate.

It is not automatically suitable in the acute phase. Consensus guidance specifically warns that high water and high speed may challenge an unprepared horse and could exacerbate acute tendon injury. (MDPI)

Post-Surgical Recovery

Some horses may benefit from water treadmill work during later-stage rehabilitation, once wounds are healed, pain is controlled, and the surgeon or vet has cleared the horse for controlled exercise.

Back and Core Weakness

Because water depth can alter thoracolumbar, pelvic, and limb movement, water treadmill work may be helpful in selected core-strengthening and topline programs. A 2022 study showed that increasing water depth affected thoracic spine movement and pelvic motion, which makes program design important for back and pelvic goals. (Hartpury University)

Deconditioning After Rest

Water treadmill exercise can support reconditioning when the horse needs controlled work without immediate return to full ridden exercise.

Performance Cross-Training

For some sport horses, aquatic therapy can provide non-ridden, straight-line conditioning and variation from normal work. A 2024 study found that repeated water treadmill exposure led to measurable movement adaptations and that sessions could be designed for specific training goals. (MDPI)

When Aquatic Therapy May Not Be Appropriate

Aquatic therapy is not right for every horse.

Use caution or avoid it when the horse has:

• Open wounds

• Skin infections

• Mud fever or pastern dermatitis

• Recent joint injections

• Acute tendon or ligament injury without vet clearance

• Unstable fractures or suspected fractures

• Severe lameness

• Neurological weakness or ataxia

• Severe back, neck, or pelvic pain

• Poor coordination

• Severe anxiety or panic in water

• Respiratory compromise, especially for swimming

• Poor hoof quality worsened by repeated soaking

• Shoes or extensions that may affect movement or damage equipment

British Equestrian guidance recommends checking horses for cuts, abrasions, and skin lesions because even clean-looking water can carry microbes. It also states horses should not undergo water treadmill exercise within four days of a joint injection and warns that daily immersion may reduce skin integrity and delay wound healing.

This is a very practical warning.

A horse with a healing wound does not need aquatic therapy just because water sounds gentle. It may need dry, clean, protected healing first.

How Worried Should You Be?

Low Concern

This is more likely when:

• The horse is sound

• Aquatic therapy is for conditioning or cross-training

• The horse has no open wounds or skin disease

• The facility is experienced

• Sessions are short and progressive

• Movement quality stays regular and straight

• The horse remains relaxed

Action: water treadmill work may be reasonable as part of a varied training program. Keep sessions goal-based rather than random.

Moderate Concern

This is more likely when:

• The horse is in rehabilitation

• The horse has mild arthritis, back weakness, or deconditioning

• The horse has recently returned from injury

• There is mild stiffness but no severe lameness

• Water depth and speed need careful adjustment

• The horse is new to the treadmill

Action: use a vet-directed program. Start gradually and monitor movement quality, soreness, swelling, and fatigue.

High Concern

This is more likely when:

• The horse has an acute tendon or ligament injury

• Lameness is present and not diagnosed

• The horse has recent joint injections

• There are wounds, skin infections, or hoof problems

• The horse panics in water

• The horse moves crookedly on the treadmill

• The horse becomes sore after sessions

Action: stop and reassess. The program may be too intense, too early, too deep, too fast, or wrong for the diagnosis.

Critical

Treat this as urgent if:

• The horse becomes severely lame

• The horse panics or attempts to climb out

• There is collapse, weakness, or ataxia

• A wound opens or becomes infected

• A limb becomes swollen, hot, or painful

• The horse shows respiratory distress during or after swimming

• The horse has severe pain after a session

Action: stop aquatic therapy immediately and call your vet.

When Is This an Emergency?

Aquatic therapy itself is not usually an emergency topic, but complications or underlying injuries can be.

Call your vet urgently if your horse has:

• Sudden severe lameness

• Non-weight-bearing lameness

• Rapid limb swelling

• Heat and pain in a tendon or joint

• A wound that opens, bleeds, or drains after water therapy

• Fever or depression

• Ataxia, weakness, stumbling, or collapse

• Respiratory distress during or after swimming

• Severe back, neck, or pelvic pain

• A horse that panics and injures itself in the facility

Do not use water therapy to “walk off” a new injury. If the horse is newly lame, the first step is diagnosis, not hydrotherapy.

What Should a Good Water Treadmill Session Look Like?

A good session should look controlled, relaxed, straight, and purposeful.

British Equestrian guidance recommends that the horse should move with a similar posture to overland locomotion, with regular rhythm, a relatively still head, straightness, hind limbs tracking in the path of the forelimbs, and the ability to maintain position on the belt. It advises avoiding a flat or overly extended posture, with the nose poking forward, neck outstretched, lumbar spine lowered, and hind limbs trailing.

A poor session may show:

• Head tossing

• Rushing

• Hanging to one side

• Rolling from side to side

• Hind limbs drifting toward the midline

• Struggling to stay in the middle of the belt

• Trailing hind limbs

• Hollow or extended posture

• Panic or bracing

• Uneven rhythm

• Worsening lameness

If movement quality deteriorates, British Equestrian guidance recommends decreasing speed, water depth, or duration.

That is the difference between training and just making the horse work harder.

How Should a Horse Be Introduced to a Water Treadmill?

New horses need habituation.

British Equestrian guidance recommends a structured introduction with three short sessions of up to 15 minutes over three consecutive days, or at least ensuring the horse can repeat the exercise within 14 days. It also recommends slowly increasing water depth over the first three sessions and notes that 10 to 15 minutes walking in water is enough for the first session, finishing once the horse is relaxed, stable, and rhythmic.

That is a sensible approach.

The first session should not be a fitness test. It should be a confidence and movement-quality session.

The aim is not to make the horse tired. The aim is to teach the horse to move calmly and correctly in a new environment.

How Often Should Horses Do Aquatic Therapy?

There is no single perfect frequency.

Protocols depend on:

• Diagnosis

• Stage of healing

• Fitness level

• Water depth

• Speed

• Duration

• Whether the horse is also ridden

• Response after sessions

• Facility experience

• Vet or rehab professional guidance

Published use varies widely. The water treadmill consensus paper reported session durations from 5 to 54 minutes across venues, with substantial variation in speeds and protocols. (MDPI)

For many rehab horses, two to four sessions per week may be used, but that is not a rule. Some horses need less. Some conditioning programs may use more. Daily use raises extra concerns about skin, feet, fatigue, and whether the horse is fully drying between sessions.

British Equestrian guidance specifically warns that feet can develop problems if session frequency prevents the feet from fully drying, especially in horses with pads fitted.

What To Do Before Starting Aquatic Therapy

1. Get a Diagnosis First

Do not start water treadmill work for vague lameness without knowing what is wrong.

A rehab plan for hock arthritis is not the same as a plan for a suspensory injury, laminitis recovery, kissing spines, back pain, or tendon strain.

2. Ask What the Goal Is

A good program should have a clear goal, such as:

• Increase joint range of motion

• Maintain fitness during reduced ridden work

• Improve core strength

• Reduce concussion during rehab

• Support return-to-work progression

• Build symmetry and straightness

• Condition without rider weight

No goal means no protocol. No protocol means expensive splashing.

3. Check for Contraindications

Before each session, check:

• Wounds

• Skin infection

• Mud fever

• Pastern dermatitis

• Loose shoes

• Pads or extensions

• New swelling

• Increased digital pulse

• New lameness

• Behaviour changes

4. Choose a Qualified Facility

Ask whether the facility:

• Uses experienced handlers

• Has safety procedures

• Monitors movement quality

• Maintains water quality

• Records session settings

• Communicates with your vet

• Adjusts speed and depth for each horse

• Has emergency procedures

British Equestrian guidance recommends a minimum of two handlers for safety and that one person should be responsible for the controls and keep them within reach throughout the session.

5. Start Conservatively

Start with short, controlled sessions, especially for horses new to the treadmill or recovering from injury.

Water therapy is low impact, not low effort. A horse can still fatigue specific muscle groups even when heart rate is not dramatically high. British Equestrian guidance notes that water treadmill exercise in walk or trot usually does not produce high heart rates, but horses may still experience fatigue in certain muscle groups.

What Not To Do

Avoid these mistakes:

• Do not use aquatic therapy before diagnosing lameness.

• Do not use high water and high speed in an unprepared horse.

• Do not put a horse with open wounds or skin disease into shared water.

• Do not use water treadmill exercise immediately after joint injections.

• Do not ignore crooked, panicked, or hollow movement.

• Do not assume swimming is safer than treadmill work.

• Do not use it as the horse’s only exercise unless there is a specific short-term rehab reason.

• Do not increase duration just because the horse looks calm.

• Do not ignore soreness the next day.

• Do not let the feet stay wet session after session without monitoring.

British Equestrian guidance states that water treadmill exercise is not recommended as the sole or primary means of exercising a horse unless a specific injury warrants it, and then usually only for a limited period.

That is a useful reality check.

Water therapy should complement a plan, not become the whole personality of the rehab program.

Common Conditions That Need Special Caution

Acute Tendon Injuries

Water treadmill work may be useful later, but early tendon injuries need rest, cold therapy, ultrasound, and a staged rehabilitation plan first. Too much water resistance or speed too early can overload healing tissue.

Laminitis

Aquatic therapy may be useful only after acute pain is controlled and the feet are stable. Acute laminitis is not a water treadmill problem. It is a veterinary emergency.

Back Pain

Water treadmill work changes thoracic, lumbar, and pelvic movement. That can be useful or provocative depending on the horse. A horse with back pain needs a diagnosis and careful depth selection.

Neurological Horses

Ataxic or weak horses may be unsafe on a water treadmill or in a pool. Water does not fix poor coordination. It can make a dangerous situation slipperier.

Skin Disease or Wounds

Repeated immersion can worsen skin integrity, delay wound healing, or spread infection risk if water management is poor.

Respiratory Disease

Swimming can increase respiratory stress in some horses because of water pressure on the chest. (The Horse)

How To Monitor Progress

Track more than whether the horse “looks better.”

Useful markers include:

• Baseline lameness score

• Limb swelling

• Joint range of motion

• Back soreness

• Muscle symmetry

• Topline development

• Hoof and skin condition

• Behaviour during sessions

• Movement quality on the treadmill

• Soreness the next day

• Ridden performance when reintroduced

• Repeat ultrasound or imaging if rehabbing tendon, ligament, or joint injury

A good rehab facility should record:

• Water depth

• Speed

• Duration

• Frequency

• Horse behaviour

• Movement quality

• Any changes made

• Any soreness or swelling after sessions

If no one is recording the settings, you do not really have a program. You have wet exercise with vibes.

Case Example: Dressage Mare After Hock Treatment

An 11-year-old dressage mare has chronic hock soreness and reduced ability to sit behind. Her vet confirms distal hock arthritis and treats the joints. The mare is rested briefly, then returns to controlled work.

A water treadmill program is added to support low-impact conditioning and encourage hindlimb range of motion without rider weight. She starts with short, low-to-moderate water sessions, then gradually increases duration and depth based on comfort and movement quality.

After four weeks, her owner notices better warm-up comfort and improved topline. The vet and rehab team adjust her ridden work, farriery, and exercise schedule so aquatic therapy supports the bigger plan rather than replacing it.

The important part is not that she used a water treadmill.

The important part is that the water treadmill had a diagnosis, a purpose, and a progression plan.

Research Gaps: What We Still Do Not Know

Aquatic therapy is widely used, but many practical questions remain.

We still need stronger evidence on:

• Best water depth for specific injuries

• Best duration and frequency for different rehab phases

• How protocols should differ for tendons, joints, backs, and laminitis recovery

• How swimming compares with water treadmill work for specific conditions

• Long-term return-to-performance outcomes

• Injury-specific safety limits

• Whether different breeds and conformations respond differently

• How water temperature affects different injury types

• How to standardise facility training and water management

UC Davis states that equine hydrotherapy has potential benefits but more studies are needed to document outcomes and inform guidelines.

That is the honest scientific position.

Aquatic therapy is useful enough to consider.

It is not researched enough to treat as universally proven for every condition.

Prevention and Performance Use

Aquatic therapy may help some horses as part of a broader prevention or conditioning program.

It may be useful for:

• Cross-training

• Reducing repetitive concussion

• Adding variety

• Maintaining fitness during reduced ridden work

• Conditioning without a rider

• Encouraging symmetrical straight-line exercise

• Supporting muscle and core development in selected horses

But prevention still depends on the basics:

• Correct diagnosis of pain

• Proper farriery

• Good saddle fit

• Suitable footing

• Controlled workload

• Adequate recovery

• Gradual conditioning

• Nutrition

• Monitoring subtle changes early

Water therapy cannot outswim bad management.

A horse with poor hoof balance, an undiagnosed suspensory injury, an ill-fitting saddle, or too much hard work still needs those problems fixed.

Myth vs Reality

Myth	Reality
Aquatic therapy is always low effort.	It can reduce impact, but water resistance can still create significant muscle fatigue.
Swimming is best for rehabilitation.	Swimming may help conditioning, but water treadmills are usually more controllable for rehab.
Water treadmills are safe for every injury.	Acute tendon injuries, wounds, skin disease, recent injections, neurological weakness, and severe lameness need caution.
Higher water is always better.	Higher water changes gait, resistance, buoyancy, back movement, and fatigue. It must match the goal.
Aquatic therapy can replace normal exercise.	It is usually best as part of a broader rehab or conditioning plan, not the only form of work.
If the horse is not sweating, it was not a workout.	Water treadmill work may not create high heart rates, but specific muscle groups can still fatigue.

FAQs About Aquatic Therapy for Horses

Is aquatic therapy good for horses?

It can be very useful for selected horses, especially when controlled movement, reduced impact, increased range of motion, or cross-training is needed. It should be matched to the horse’s diagnosis, fitness, injury stage, and response.

Is a water treadmill better than swimming?

For rehabilitation, a water treadmill is often more controllable because speed, water depth, straightness, and movement quality can be adjusted. Swimming may be useful for conditioning in selected horses, but it can involve unnatural posture, strong hind limb movement, and respiratory stress in some horses. (The Horse)

How often should a horse use a water treadmill?

It depends on the goal and injury. Some horses may use it two to four times per week, while others need less or more structured progression. Protocols vary widely, so frequency should be guided by your vet, rehab professional, and the horse’s response. (MDPI)

Can water therapy help tendon injuries?

It may help later in rehabilitation when controlled loading is appropriate, but it is not a first step for an acute tendon injury without diagnosis. Acute tendon injuries need veterinary assessment, imaging, and a staged rehab plan before water treadmill work is added.

Can horses use a water treadmill with shoes on?

Yes, horses can work shod or unshod, but shoes must be secure and suitable. British Equestrian guidance notes that road nails may damage treadmill belts and shoe extensions can affect foot flight in water, so vet and farrier advice may be needed.

The Bottom Line

Aquatic therapy can be a valuable part of equine rehabilitation and conditioning, especially when the goal is controlled, low-impact, resistance-based exercise.

But it is not magic.

Water depth, speed, duration, frequency, horse experience, injury type, and movement quality all change what the session does. A well-designed water treadmill program can support recovery and conditioning. A poorly matched program can fatigue the wrong tissues, worsen soreness, stress a nervous horse, or delay proper diagnosis.

The safest approach is simple:

• Diagnose the problem first.

• Decide the goal.

• Start conservatively.

• Adjust water depth and speed to the horse.

• Monitor movement quality.

• Watch for soreness, swelling, wounds, skin issues, or fatigue.

• Use aquatic therapy as part of a broader vet-guided plan.

Good aquatic therapy is not about getting the horse wet.

It is about using water precisely enough to help the horse recover, strengthen, and return to work safely.

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If your horse is recovering from injury, struggling with stiffness, or starting a water treadmill program, ASK A VET™ can help you organise the signs, injury history, goals, and questions to discuss with your vet and rehabilitation team.