How to Teach Your Dog Voluntary Head Dunking for Cooling

How to Teach Your Dog Voluntary Head Dunking for Cooling

By Dr Duncan Houston

Teaching a dog to place their face into water may sound like a party trick, but for the right dog it can be a useful post-exercise cooling skill.

The critical word is voluntary. Your dog must be alert, comfortable and able to withdraw at any time. Head dunking should never involve pushing, restraining or holding a dog’s head underwater.

Quick Answer

Voluntary head dunking is a trained behaviour in which a dog willingly immerses their face in clean water to retrieve food or a toy.

In a small study of healthy working dogs, trained head dunking produced faster early cooling than neck ice packs or wet towels placed around the neck or armpits. However, it was not compared with whole-body immersion and was not studied as a treatment for clinical heatstroke.

Only offer a head dunk to an alert, coordinated and previously trained dog who can comfortably pause panting. Never attempt it in a dog who is collapsing, confused, seizing, struggling to breathe or unable to stop panting.

What Is Voluntary Head Dunking?

Voluntary head dunking involves teaching your dog to retrieve a reward from a stable container while water is gradually added.

The dog remains in control throughout the process. They can approach, immerse their face, retrieve the reward and move away without being held or pressured.

It is not:

• Pouring water over your dog’s face

• Pushing their head into a bowl

• Holding their muzzle underwater

• Forcing an untrained dog to perform when hot

• Submerging the head of a collapsed or distressed dog

A safe head dunk should look deliberate, relaxed and easy for your dog to stop.

What Did the Research Find?

A 2024 randomised crossover study published in JAVMA evaluated four portable cooling methods after exercise-induced hyperthermia:

• Chemical ice packs around the neck

• A wet towel around the neck

• Wet towels placed under the front legs

• Voluntary head immersion in water at approximately 22°C

The study involved 12 healthy working dogs weighing at least 18 kg. Only nine successfully completed the head-dunking protocol.

A successful dunk involved the water reaching approximately eye or ear level. Dogs were allowed up to three voluntary dunks within 30 seconds while retrieving food or a toy.

Among the four methods tested, head dunking:

• Produced the lowest average core temperature during the first five minutes

• Was the only method that prevented the immediate post-exercise temperature rise

• Produced lower temperatures during the following 35 minutes

All four methods eventually returned the group’s average temperature towards baseline. Some individual trials still required additional whole-body water cooling, including four trials involving head dunking.

What the study does not prove

The results are encouraging, but they should not be stretched further than the evidence allows.

The study:

• Included a small number of selected, healthy working dogs

• Did not specifically investigate brachycephalic, elderly or medically compromised dogs

• Did not compare head dunking with whole-body water immersion

• Did not involve dogs with clinical heatstroke

• Required prior training

• Included some water ingestion, which may have contributed to cooling

• Had three dogs who could not successfully complete the protocol

The accurate conclusion is that voluntary head dunking was the most effective of the four portable methods tested when whole-body immersion was unavailable. It is not automatically the best cooling method for every dog or situation.

How Might Head Dunking Cool a Dog?

Dogs lose most of their excess heat through panting rather than sweating across their skin.

When a dog becomes hot, blood flow increases around the tongue, muzzle, nasal tissues and other superficial areas of the head. The study authors proposed that immersing these well-perfused tissues may cool the blood before it circulates back through the body.

Limited water ingestion may also contribute to the cooling effect.

A separate JAVMA cooperative-care tutorial noted that clean water may help remove loose dust or debris from around the eyes and nasal openings. However, this should not be presented as a general eye or nose treatment.

Squinting, eye pain, redness, injury, bleeding or persistent eye or nasal discharge requires veterinary assessment.

Which Dogs May Benefit?

Head dunking may suit dogs who:

• Are healthy, alert and coordinated

• Enjoy interacting with water

• Can comfortably pause panting

• Participate in running, hiking, working or dog sports

• Remain highly driven during exercise

• Need a portable cooling option when body immersion is unavailable

• Have already learnt the behaviour under calm conditions

Dogs at increased risk of heat-related illness need greater caution, not more exercise simply because a cooling bowl is available.

When Should Head Dunking Be Avoided?

Do not attempt head dunking if your dog:

• Is collapsed, weak, confused or poorly responsive

• Is staggering or unable to coordinate their movements

• Is having a seizure

• Has laboured, noisy or distressed breathing

• Cannot comfortably pause panting

• Is coughing, gagging or struggling to swallow

• Is vomiting or repeatedly retching

• Is frightened of the water or trying to escape

• Has a swallowing disorder or history of aspiration

• Has active or recurrent ear disease without veterinary approval

• Has an eye injury, corneal ulcer or recent eye surgery

• Has significant or persistent eye or nasal discharge

Brachycephalic dogs are at increased risk of overheating because they cannot cool themselves as effectively through panting. Some may learn head dunking, but a dog with noisy or difficult breathing may be unable to pause panting safely and may be a poor candidate.

What You Will Need

Choose a cool, quiet training area and gather:

• A wide, stable bowl or container

• A non-slip mat beneath the container

• Clean, fresh drinking water

• Small sinking treats or a washable toy

• A clicker or verbal marker such as “yes”

• Additional rewards delivered from your hand

• A towel for the surrounding floor

Use room-temperature or cool tap water. The cooling study used water at approximately 22°C. Ice water is unnecessary for training and may make the experience uncomfortable.

Remove dangling tags or equipment that could catch on the container. Only remove your dog’s collar in a secure, enclosed area.

Train while your dog is cool, rested and breathing normally. An overheated dog is not in the right condition to learn a new behaviour.

How to Teach Voluntary Head Dunking

Step 1: Introduce the Empty Container

Place the empty container on a non-slip surface and allow your dog to investigate it.

Mark and reward voluntary interest, including:

• Looking at the container

• Moving towards it

• Sniffing the rim

• Placing their nose inside

Do not push your dog towards the bowl or position your body so they feel trapped.

Continue until your dog approaches confidently.

Step 2: Practise a Dry Retrieval

Place a familiar treat or toy inside the empty container.

Allow your dog to reach in and retrieve it. Mark the behaviour and provide another reward from your hand.

Repeat for only a few successful repetitions. The goal is to make reaching into the container predictable and enjoyable.

Step 3: Add a Small Amount of Water

Add a very shallow layer of clean water. Let your dog see you place the treat or toy into the container.

At first, your dog may only touch the water with their lips or nose. That is perfectly acceptable.

If your dog hesitates:

• Use less water

• Return to the empty container

• Choose a more motivating reward

• Finish the session and try again later

Training may take minutes, several sessions or several weeks. Some dogs will never enjoy it, and that is fine too.

Step 4: Increase the Depth Gradually

Increase the water level in small amounts only when your dog is confidently retrieving the reward.

Watch for:

• A loose body

• Voluntary re-approach

• Normal breathing between repetitions

• Willingness to take rewards

• Easy withdrawal from the container

The published cooling study defined a successful head dunk as immersion to approximately eye or ear level. A shallow nose dip has not been shown to provide the same cooling effect.

However, there is no prize for maximum depth. Never pressure your dog to immerse further than they willingly choose.

Stop immediately if your dog coughs, gags, splutters, panics or appears unable to coordinate breathing and swallowing.

Step 5: Add a Cue

Once the behaviour is predictable, introduce a cue such as “dunk”.

Say the cue immediately before your dog begins the familiar retrieval. Mark the completed dunk and reward after your dog lifts their head.

Over time, you may gradually fade the food placed in the water and reward from your hand instead. The water-filled container must remain present. A cue without any water or container serves no cooling purpose.

The cue should remain an invitation. Your dog must always be free to decline.

Using Head Dunking After Exercise

Practise the behaviour thoroughly in calm conditions before using it as a cooling tool.

After exercise:

1. Stop the activity and move your dog into shade or air conditioning.

2. Check that your dog is alert, coordinated and responding normally.

3. Confirm that they can comfortably pause panting.

4. Present the familiar container.

5. Offer the cue once and allow your dog to choose.

6. Permit only a few comfortable dunks.

7. Provide fresh drinking water and continue monitoring recovery.

The study allowed up to three dunks within 30 seconds. This was a research protocol, not a requirement every owner must achieve.

Do not use head dunking to cool your dog briefly and then send them straight back into strenuous activity. Cooling is not a permission slip to keep exercising in unsafe conditions.

Signs Your Dog Is Becoming Too Hot

Heat-related illness can progress quickly and dogs do not always pass neatly through predictable stages.

Risk level	Possible signs	What to do
Expected post-exercise recovery	Alert, coordinated, panting that settles promptly, normal responses	Stop activity, move into shade, provide water and monitor
Concerning heat stress	Persistent heavy panting, excessive drooling, slowing down, shade-seeking, restlessness, very red gums or reduced response to cues	Begin active cooling and contact a veterinarian
Emergency	Laboured breathing, weakness, staggering, vomiting, diarrhoea, collapse, confusion, seizures, pale, grey or blue gums, bleeding or unconsciousness	Begin emergency cooling and transport to a veterinary hospital immediately

Do not wait for every sign to appear. A dog who becomes confused, weak or uncoordinated is already in serious trouble.

What to Do if You Suspect Heatstroke

Head dunking is contraindicated when heatstroke is suspected.

Current RECOVER veterinary first-aid guidance recommends beginning active cooling before transport.

1. Stop all activity

Move your dog away from the heat and into shade, air conditioning or another cool environment.

2. Contact an emergency veterinarian

Call while cooling begins so the veterinary team can prepare for your arrival.

3. Apply cool running water to the body

Run cool water over the body behind the neck, concentrating on thinner-haired areas such as the underside of the abdomen. Soak through the coat to the skin.

Avoid pouring water over the face because a distressed dog may inhale it. Running water or repeated dousing is preferable to covering the dog with wet towels.

4. Increase airflow

Use a fan, breeze or air conditioning to promote heat loss while the dog is wet.

5. Protect the airway

Do not:

• Submerge the head

• Force water into the mouth

• Make an unconscious or confused dog drink

• Attempt head dunking

• Delay care while trying to obtain a perfect temperature reading

If a rectal temperature can be measured safely without delaying treatment, RECOVER recommends stopping active cooling at approximately 39.7°C to 40°C. Follow the emergency veterinarian’s instructions if breathing remains abnormal.

6. Transport promptly

Move the dog in a cool, well-ventilated vehicle. Heatstroke can damage the brain, kidneys, gastrointestinal tract, liver and clotting system even when the dog appears to improve.

Veterinary assessment is still necessary after apparent recovery.

What Else Can Cause Poor Exercise or Heat Tolerance?

A dog who repeatedly struggles after mild exercise may have more than a low tolerance for warm weather.

Possible problem	Clues that may be present
Brachycephalic obstructive airway syndrome	Noisy breathing, snoring, gagging, poor exercise tolerance
Laryngeal paralysis	Harsh breathing noise, altered bark, coughing or gagging
Heart or lung disease	Coughing, rapid breathing, fainting or reduced stamina
Obesity or poor conditioning	Early fatigue and prolonged recovery
Pain or orthopaedic disease	Slowing down, stiffness, limping or reluctance to move
Fever or systemic illness	Lethargy, reduced appetite or heat intolerance without substantial exercise

Arrange a veterinary examination if your dog takes unusually long to recover, struggles after ordinary activity or has developed a new sensitivity to heat.

Common Head-Dunking Mistakes

Forcing the dog

Pushing or holding a dog’s head underwater creates fear and risks water aspiration.

Increasing the depth too quickly

Progress only when your dog remains relaxed and willingly returns to the container.

Teaching it during a heat emergency

Train while your dog is cool and comfortable. An overheated dog needs cooling, not a training lesson.

Asking a heavily panting dog to retrieve food

A dog must be able to pause panting, retrieve and swallow safely.

Allowing repeated water gulping

Some water ingestion is expected. Stop if your dog begins gulping large quantities, coughing or gagging.

Using dirty or natural water

Use fresh drinking water in a controlled container. Lakes, rivers and stagnant water can contain pathogens, harmful algae, currents or hidden hazards. The CDC advises keeping pets away from water affected by harmful algal blooms.

Assuming it prevents heatstroke

A trained dunk may assist post-exercise cooling, but it cannot make unsafe weather or excessive exercise safe.

Using it instead of veterinary care

Head dunking does not treat heatstroke, breathing distress, collapse, eye injury or persistent nasal disease.

Preventing Heat-Related Illness

Prevention remains more reliable than any cooling technique.

• Exercise during cooler parts of the day.

• Reduce activity when humidity is high.

• Carry fresh water and provide frequent breaks.

• Build fitness and heat acclimatisation gradually.

• Avoid hot vehicles and poorly ventilated spaces.

• Stop when your dog begins slowing down.

• Maintain a healthy body condition.

• Take extra care with brachycephalic, elderly, thick-coated or medically compromised dogs.

• Never use equipment that prevents effective panting during exercise.

Frequently Asked Questions

Does every dog need to learn head dunking?

No. It is an optional skill. Dogs who dislike water should be cooled using other appropriate methods.

How deep should the water be?

Begin with a thin layer and increase it gradually. The study tested immersion to approximately eye or ear level, but your dog should never be forced to reach that depth.

Should I use cold water?

Clean, room-temperature or cool tap water is appropriate for training. The published study used water at approximately 22°C.

Can brachycephalic dogs learn it?

Some may be able to, but these dogs have an increased risk of overheating and breathing difficulty. A dog who cannot comfortably pause panting should not head dunk.

Can it cause an ear infection?

Water does not automatically cause an ear infection, but repeated moisture may aggravate active or recurring ear disease. Ask your veterinarian whether the technique is appropriate for your dog.

Can I use a swimming pool, sea or lake?

A stable container filled with fresh water provides better control. Pool chemicals, salt water, algae, contamination, currents and uneven footing make uncontrolled water sources less suitable.

Can it flush my dog’s eyes or nose?

It may remove minor loose dust or debris. Eye pain, squinting, injury, redness, bleeding or persistent discharge requires veterinary attention.

What if my dog drinks while dunking?

Swallowing a small amount is common. Stop if your dog begins gulping, coughing, gagging or repeatedly drinking large volumes.

Can I use head dunking for heatstroke?

No. Suspected heatstroke requires immediate body cooling and emergency veterinary care. Do not submerge the head of a distressed, confused or collapsed dog.

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Voluntary head dunking can be a useful cooling and cooperative-care skill for the right dog. Keep it genuinely voluntary, introduce the water gradually and practise before the skill is ever needed.

If you are unsure whether head dunking is appropriate for your dog, speak with your veterinarian or contact ASK A VET™ for personalised guidance.