Explosives and Chemicals

Explosives and hazardous chemicals are among the most critical sources of danger that K9 units encounter in operations. Detection dogs mark scents precisely – but they cannot assess whether a substance is stable, degraded, or could detonate immediately due to mechanical impact. Handlers work in immediate proximity to the dog and therefore bear special responsibility: they must recognize hazards early, report them correctly, and consistently maintain distance until specialists take over.

This guide expands on the topic in the context of the overarching Hazards in Operations. It is aimed at handlers, trainers, and incident commanders who want to safely manage explosive and CBRN situations with service dogs.

Why Explosives and Chemicals Have a Special Status

Unlike mechanical hazards such as debris or sharp edges, explosives and chemicals are often invisible, odorless to humans, and yet highly dangerous to the dog. The service dog's keen sense of smell is both a strength and a risk here: it finds substances that technical devices miss – and in doing so gets closer to the source of danger than any other responder.

Typical operational scenarios include:

• Security checks before major events and at security-relevant facilities
• Searches for hidden explosive devices in vehicles, luggage, and buildings
• Follow-up detection work after fires or industrial accidents with chemical residues
• Customs and border controls involving illegally transported explosives or precursors

Types of Explosives and Chemical Substances at a Glance

Explosive detection dogs are trained on defined scent signatures. The range extends from classic military and commercial explosives to homemade mixtures made from legally available precursor products. Chemical hazards in operations additionally include industrial chemicals, fire residues, asbestos, and biological-chemical contaminants after accidents.

Detailed technical information on individual substance groups can be found in the articles Types of Explosives and Explosive Detection. Explosive Detection Dog Training provides the foundation for reliable indication by the dog – but not for assessing the danger.

Explosives vs. Chemicals in K9 Operations

Routes of Exposure and Health Risks

Dogs absorb hazardous substances faster than humans because they place their noses directly on surfaces while searching and can become contaminated via paws, coat, and mucous membranes.

Primary Routes of Exposure for Service Dogs

1. Nasal and respiratory contact – Inhalation of vapors, aerosols, or dust directly at the source
2. Oral intake – Ingestion through licking paws or contaminated objects
3. Dermal contact – Contamination of paws, belly, and chest during ground contact
4. Eye contact – Splashes and dust in sensitive mucous membranes

Risks for the Handler

The handler is the second person affected: they lead the dog, take the leash in the find zone, and care for the animal afterward. Without protective gloves, without a decontamination plan, and without knowledge of the substance, skin irritation, respiratory problems, and long-term health damage are possible. Health Protection for the Dog and the handler's personal protective equipment must therefore always be planned together.

Protective Measures Before and During Operations

Effective protection begins in operational preparation. Those who know that explosives or chemicals may be involved plan search routes, abort criteria, and minimum distances before the dog leaves the vehicle.

Organizational Measures

• Involvement of explosive ordnance experts, CBRN units, or technical services before operation begins
• Clear radio codes for finds, suspicion, and withdrawal
• Defined minimum distances according to situation (suspicion vs. secured find)
• Decontamination plan for dog, handler, and equipment
• Documentation of all find locations for subsequent evidence preservation

Protective Measures in Operations describes the overarching equipment and behavioral rules that are mandatory for explosive and chemical situations.

Technical and Personal Protective Equipment

For the handler, depending on the situation, this may include:

• Chemical protection or nitrile gloves for find zones
• Safety goggles when dust or splash hazard exists
• Respiratory protection as specified by incident command (do not improvise on your own)
• Disposable blankets or mats for transporting the dog after contamination
• Separate decontamination kits for paws and coat

For the dog:

• Protective vest only where it does not impair mobility and is professionally approved
• Paw protection in contaminated areas after coordination with CBRN teams
• Sufficient drinking water from a safe source – never from suspicious containers on site

Behavior on Indication and Find

When the detection dog indicates, the most critical phase begins. The handler must not loosen the leash out of pressure to succeed or "briefly confirm" the find location.

Standard Procedure in Six Steps

1. Stop – Leash the dog on the spot, no further movement toward the source
2. Mark – Report position precisely via GPS and radio, no vague location descriptions
3. Withdraw – Maintain minimum distance per operational guidelines, document return route
4. Secure – Cordon off area, do not allow further persons or animals inside
5. Handover – Brief explosive or CBRN specialists, do not "show" find by approaching
6. Decontamination – Clean dog and equipment as specified, inform veterinarian

Typical Mistakes That Must Be Avoided

• Pulling the leash to make the indication "look better"
• Repeated searching in the same area without clearance
• Photos or videos from unsafe distance
• All-clear without written clearance from specialists
• Transporting the dog in a contaminated vehicle without interim decontamination

Decontamination and Aftercare

After every operation with suspected explosives or chemicals, structured aftercare is mandatory – even if the dog appears outwardly unaffected.

Decontamination and Aftercare Checklist

• Dog moved from hazard area to defined cleaning zone
• Paws, belly, and coat cleaned per CBRN guidelines
• Leash, harness, and muzzle decontaminated or disposed of
• Handler's hands and equipment cleaned
• Veterinarian or operational veterinarian informed and appointment scheduled
• Symptoms monitored and documented over 24–48 hours
• Operation report completed with substance suspicion and measures taken
• Debriefing with incident command and, if applicable, explosive ordnance experts

With known contact with corrosive or toxic substances: no home remedies, no unauthorized rinsing without veterinary instruction. Incorrect measures can worsen damage.

Training, Practice, and Operational Limits

Explosive detection dogs undergo specialized training with controlled training substances under safe conditions. In operations, different rules apply than in training: there is no second chance for wrong decisions.

What Handlers Should Master Professionally

• Basic explosive knowledge: substance groups, initiation, typical hiding places
• Recognizing suspicious indicators: suspicious wiring, containers, unusual odors for humans
• Distance rules and responsibilities of emergency services
• Handling false alarms vs. real finds – both require discipline
• Communication with incident command in clear, non-technical language

Operational Limits of the Dog

The dog is not a measuring device and not a robot. Wind, temperature, overload, and stress influence indication. With chemicals of low volatility or after long storage, the concentration at ground level may be so low that even a well-trained dog does not indicate – technical devices and specialists supplement but do not generally replace the dog.

Cooperation with Specialists and Incident Command

K9 units are never solely responsible in explosive and CBRN situations. Incident command coordinates police, fire department, technical services, and medical personnel. The handler provides the basis for their decisions through precise reports.

Recommended radio content on indication:

1. Type of operation (suspected explosive / chemical / unclear)
2. Exact position (address, building section, vehicle, floor)
3. Number of persons and dogs involved in the hazard area
4. Distance already maintained and cordon status
5. Observations of the dog (type of indication, behavior afterward)