Does pet insurance cover processionary caterpillar poisoning?

A pet policy with vet-fee cover is designed for exactly this kind of accidental emergency — the consultation, sedated lavage, medication and any follow-up care. Cover and limits vary, so check the vet-fee limit when you take out the policy. Turner Insurance arranges Generali pet cover in English.

When is the safest time of year to walk dogs in Spanish pine forests?

The lowest-risk months on the Costa Blanca and across Mediterranean Spain are May to October, when the caterpillars are buried as pupae in soil. Risk rises sharply from November as the new generation feeds in nests; the absolute peak is January to April when processions cross the ground.

What is the Spanish for processionary caterpillar?

In Spanish the species is called oruga procesionaria del pino or simply procesionaria del pino. If you need to tell a vet, say 'mi perro ha tocado procesionaria' — 'my dog has touched processionary'.

Pine Processionary Caterpillars in Spain: 2026 Dog & Human Safety Guide

Q: What is a pine processionary moth?

The pine processionary moth (Thaumetopoea pityocampa) is a small drab grey-brown moth, active July–September, that lays its eggs in spiral bands on pine needles. The eggs hatch into the caterpillars that build silk nests over autumn and winter and descend in head-to-tail processions in late winter or spring. The adult moth itself does not bite or sting; the danger is the caterpillar.

By Andrew Turner — exclusive agent in Jávea since 2007 · DGS Registry C0467B54657010 · Last reviewed May 2026

The pine processionary caterpillar (Thaumetopoea pityocampa, in Spanish procesionaria del pino) is the larva of the pine processionary moth, and it is the single most dangerous insect in Spain for dogs and small children. Each spring the white silk nests in pine trees split open and the caterpillars descend in long head-to-tail processions, releasing tens of thousands of microscopic urticating hairs that can cost a dog part of its tongue or its life. This is the complete English-language safety guide for residents and visitors — how to identify the species, when it is active in your region, the symptoms in dogs, cats and humans, the first 15 minutes of emergency first aid, the vet treatment pathway, typical Costa Blanca vet costs, and how Spanish pet insurance covers the bill. Written from our Jávea office.

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Quick Answer · Processionary Caterpillars

Dangerous to dogs?Yes — a veterinary emergency

Danger seasonNests in winter; processions Jan–Apr

If your dog touches oneRinse mouth with water, go to the vet now

Harmful to humans?Yes — skin, eyes, breathing

Vet billPet vet-fee cover applies

What are pine processionary caterpillars?

The pine processionary (Thaumetopoea pityocampa) is the larva of a moth that lives in pine trees throughout Spain — very common on the Costa Blanca, Costa Cálida and across inland pine country. You will recognise two unmistakable signs:

The nests: dense white silk balls, like clumps of cotton wool, hanging in the branches of pine trees through autumn and winter.
The processions: in late winter and spring the caterpillars leave the nest and move across the ground in long head-to-tail lines — nose to tail, sometimes dozens long — which is where the name comes from.

Each caterpillar is covered in thousands of microscopic barbed hairs that release an irritating toxin (thaumetopoein) on contact. The hairs detach easily and are even dangerous airborne or after the caterpillar is dead.

Why they are so dangerous to dogs

Dogs are the most common — and most serious — victims, because their instinct is to sniff, paw and lick the caterpillars moving along the ground. Contact with the mouth, tongue or nose drives the toxic hairs into soft tissue, and the reaction is fast and severe:

Sudden, intense drooling and salivation
Swelling of the tongue, lips and muzzle, often within minutes
Pawing at the mouth, restlessness and pain
In bad cases, necrosis (tissue death) — parts of the tongue can turn dark and slough away
Vomiting, fever, and in severe cases breathing difficulty or shock

A dog can permanently lose part of its tongue, and without prompt treatment the reaction can be fatal. This is never a “wait and see” situation.

When are they active in Spain?

The danger period runs across the cooler months:

Autumn & winter: the white nests build up and are visible in the pines.
Late January to April: the caterpillars descend and form their processions on the ground — the most dangerous phase for pets and children. Warmer winters bring them down earlier, sometimes from December.

Climate change has been pushing the season earlier and extending the caterpillar’s range northwards and to higher altitudes, so do not assume an area is safe just because it once was.

What to do if your dog makes contact

This is a veterinary emergency. Go to a vet immediately. While you prepare to travel, act fast at home — the toxin works within minutes.

Rinse the mouth repeatedly with warm (not hot) water. Wear gloves, and pour or splash rather than rub — rubbing breaks more hairs and spreads the toxin.
Do not let the dog lick the affected area or swallow the rinse water if you can avoid it.
Do not use home remedies or try to neutralise the toxin yourself — get to the vet.
Call your vet on the way so they are ready; out of hours, find the nearest emergency clinic (clínica veterinaria de urgencias).

Protecting your dog — and yourself

Keep dogs on the lead in or near pine areas during the danger season.
Scan the ground for processions and the trees for nests before letting a dog off-lead.
Never touch caterpillars or nests with bare hands. In people the hairs cause itchy rashes, eye irritation and breathing problems — and reactions can be severe in children.
Do not remove nests yourself. Disturbing a nest releases clouds of airborne hairs. Use a professional pest-control firm or your local ayuntamiento, which handle removal and tree treatment safely.

Lifecycle of the pine processionary moth

Understanding the lifecycle is the simplest way to know what to look for and when. The pine processionary moth completes one generation per year and the dangerous larval (caterpillar) stage runs for five to seven months.

Stage	Months	What you see / risk
Adult moth flight & egg-laying	Jul–Sep	Drab grey-brown moths around pine canopies at dusk; eggs in spiral bands on pine needles. Low risk.
L1–L2 larvae (small caterpillars in nest)	Sep–Nov	Tiny caterpillars build the first silk shelters in pine tops. Hairs not yet fully developed. Low risk.
L3 (urticating hairs develop)	Nov–Dec	Larvae grow the toxin-bearing setae for the first time. Disturbed nests now release airborne hairs — risk to anyone in the woods.
L4–L5 (mature nests & feeding)	Dec–Feb	The unmistakable cotton-wool nests are at peak size on south-facing branches. High risk for anyone disturbing nests; ground risk still low.
Procession to pupation	Jan–Apr	Maximum danger phase. Caterpillars descend in head-to-tail processions to bury themselves in soil. Ground contact is when dogs are poisoned.
Pupation underground	Apr–Jul	Caterpillars buried 5–25 cm below the soil surface, developing into adult moths. Surface risk decreasing.

Climate change has shifted the cycle visibly: in coastal Costa Blanca, parts of Andalucía and the Balearics, processions now start in late December in mild years rather than the historic January–February window. AEMET data and university studies confirm a measurable northward and altitude-ward expansion since 2010.

Where the pine processionary lives in Spain

The pine processionary is present throughout mainland Spain, the Balearic Islands and (introduced) parts of the Canaries. The species attacks every major pine species native to Spain — with preferences:

Heavily infested species (high-risk hosts): Pinus pinaster (maritime pine), P. nigra (black pine), P. sylvestris (Scots pine), P. halepensis (Aleppo pine — the dominant Costa Blanca pine).
Moderately infested: Pinus pinea (stone pine — widespread in central Spain, Andalucía, Balearics) and various ornamental cedars.
Lower risk: non-native conifers, but never zero.

Regional hotspots within Spain include:

Costa Blanca — Aleppo pines from Dénia to Pilar de la Horadada; particularly bad in Pinar de Campoverde, Albir hinterland, Pego marsh edges, Jávea Cap de Sant Antoni, and the urbanisations behind Moraira and Calpe.
Costa Cálida and the Murcia interior — very high nest density on lower-altitude maritime pines.
Andalucía — Sierra Morena and inland Almería.
Castilla y León / Castilla–La Mancha — the largest absolute populations on stone pine plantations.
Balearic Islands — Mallorca and Menorca see major infestations, particularly around inland pine forest.
The Canary Islands — a recent (2020) accidental introduction is now established on Gran Canaria with regional containment efforts under way.

If you live in or visit any of these areas, assume the caterpillar is present in any pine forest from late November through April.

The biology of the urticating hairs (and why they are so toxic)

Each mature processionary caterpillar carries roughly 500,000–1,000,000 microscopic barbed hairs (called setae) on its dorsal surface. The hairs are loaded with a protein called thaumetopoein, which triggers two parallel reactions in mammals:

A direct mechanical and chemical injury — the barbed hair penetrates skin or mucous membrane, releasing thaumetopoein into the tissue, causing immediate local inflammation, swelling and eventually necrosis.
An IgE-mediated allergic reaction — on repeat exposure, the body mounts an antigen-specific immune response which can escalate to anaphylaxis. Veterinary surgeons in heavily infested regions document repeat-exposure dogs presenting in shock far faster than first-exposure dogs.

The hairs are shed continuously and remain biologically active for months after the caterpillar has died or moved on. They can become airborne in wind and contaminate cars, garden furniture, washing on the line and the ground around former nest sites. Dogs and children do not need to touch a live caterpillar to be poisoned — brushing through grass under an infested tree is enough.

Symptoms in dogs: the timeline

If a dog has had contact with a caterpillar or with airborne hairs, the reaction is typically rapid and follows a recognisable timeline.

Time since contact	What you see
0–5 minutes	Sudden, profuse drooling. Pawing at the mouth. Visible distress and pain. Dog may shake its head or rub its face on the ground.
5–30 minutes	Pronounced swelling of the tongue, lips and muzzle. Tongue may appear bright red, then purple or grey at the edges. Vomiting in some dogs.
30 min – 2 hours	Worsening swelling. Tongue tip and edges turn dark as the tissue begins to die. Fever, lethargy, sometimes ataxia (unsteady gait). Difficulty swallowing.
2–24 hours	Necrotic tongue tissue starts to slough away. The dog may stop eating and drinking. Without treatment, secondary infection sets in. Severe cases progress to systemic shock.
24+ hours (untreated)	Partial or total tongue loss; airway compromise; organ damage. Mortality rises sharply.

A dog that licks a single caterpillar in March can be in surgical theatre by lunchtime. Treat any sudden drooling-plus-mouth-pawing during processionary season as a presumed exposure and drive to the vet immediately.

Symptoms in cats, horses, livestock and wildlife

Cats — less commonly affected because they avoid the caterpillars, but mouth and paw contact produces similar swelling and necrosis. Outdoor Costa Blanca cats can carry hairs home on their fur, which then transfer to children or other pets.
Horses and ponies — grazing in infested pastures can cause swelling of the lips, severe colic and respiratory distress. Tongue necrosis is well documented in horses across Andalucía and Extremadura.
Sheep, goats and cattle — less severe systemically but can develop oral lesions, weight loss and reduced milk production.
Wildlife — foxes, hedgehogs and game birds are also affected; researchers consider the caterpillar a significant secondary cause of pine-forest wildlife stress.

Symptoms in humans — and why children are at highest risk

Adults usually escape with itching, rash and watery eyes. Children, however, can suffer markedly worse reactions because they have lower body mass, more sensitive skin and a habit of picking things up off the ground. Symptoms in humans:

Skin (the most common): a fiery, intensely itchy red rash, often raised, distributed wherever skin contacted hairs. Onset within 30–120 minutes; lasts up to a week.
Eyes: conjunctivitis (red, watering, painful eyes), occasionally corneal abrasion or hair embedment requiring slit-lamp removal. Rubbing eyes after touching a caterpillar is the classic injury route.
Respiratory: coughing, sore throat, wheezing or asthma-like attacks if hairs are inhaled. Particularly serious in asthmatic children.
Anaphylaxis (rare but possible): facial swelling, breathing difficulty, sudden drop in blood pressure. Call 112 immediately. See our Emergency Numbers in Spain guide for the call procedure.

If a child has touched a caterpillar, rinse the affected area thoroughly with running water, do not rub, change clothing (the hairs cling to fabric) and bag the clothes for cold-water laundry. Antihistamines and topical corticosteroids are typical pharmacy advice; in severe or worsening cases see a doctor or call 112.

Emergency first aid for dogs: the first 15 minutes

This is the critical window. The faster you act, the less tissue damage and the better the prognosis.

Step 1 — Call your vet now

Phone the vet on the way (do not delay the journey to make the call). Tell them: “mi perro ha tocado procesionaria” — my dog has touched a processionary. They will prepare medication and an IV line for arrival.

Step 2 — Rinse the mouth with warm water

Use lukewarm water (cold water is uncomfortable; hot water can scald the inflamed tissue). Pour or splash from a bottle. Do not rub — rubbing snaps the brittle hairs and drives them deeper. Wear waterproof gloves. Aim for two minutes of continuous flushing, then let the water drain (do not let the dog swallow). Some vets recommend a teaspoon of baking soda dissolved in the rinse water to mildly buffer the alkaline toxin.

Step 3 — Drive to the vet

Cover the back seat with a towel; the dog will continue to drool. Keep windows open; some dogs struggle to breathe. Bring someone to comfort and observe.

Step 4 — Tell the vet what you saw

Useful information: time since contact, whether you saw the caterpillar or only suspect it, whether other dogs in the group were affected, any prior exposure history.

What NOT to do

Do not rub the mouth or scratch the affected area — this breaks more hairs and accelerates the toxin release.
Do not induce vomiting — corrosive irritation will worsen.
Do not give human medication (paracetamol, ibuprofen) — toxic to dogs.
Do not wait to see if symptoms improve — this is one of the few emergencies where every minute genuinely counts.

What the vet will do (treatment pathway)

Treatment is well established at every veterinary clinic in caterpillar-prevalent Spain. Typical pathway:

IV access and fluid therapy — supports circulation, dilutes systemic toxin.
Mouth lavage under sedation — the vet sedates the dog, opens the mouth fully and physically flushes the oral cavity to remove residual hairs. Done within the first hour where possible.
Corticosteroids (dexamethasone, prednisolone) — reduce inflammation and the immune response.
Antihistamines — manage the histamine surge and itching.
Analgesia (NSAID-style or opioid in severe cases) — severe oral pain.
Antibiotics — prophylactic, to prevent secondary infection of necrotic tissue.
Observation 12–72 hours — severe cases require overnight hospitalisation.
Surgical debridement — in cases with significant tongue necrosis, the vet may need to surgically remove dead tissue. Some dogs lose the tongue tip and adapt; severe cases lose larger portions and may need feeding-tube support during recovery.

Typical Costa Blanca vet bill for processionary poisoning

Costs vary by clinic and severity. As a 2026 guide for the Costa Blanca:

Mild case (early, brief exposure, no necrosis): consultation, IV fluids, single corticosteroid + antihistamine dose, observation 2–4 hours — typically €120–€220.
Moderate case (sedated lavage, overnight observation, full medication course): typically €300–€600.
Severe case (intensive care, surgical debridement, multi-day hospitalisation, repeat anaesthetic): can reach €800–€1,800 or more.
Out-of-hours surcharge (Sundays, Easter, August holidays, night calls): commonly adds 40–70% to the base cost.

A Spanish pet insurance policy with vet-fee cover pays directly — you don’t need to find the money up front. Generali Mascotas vet-fee limits start at €1,200 and rise to €6,000+ depending on the tier chosen.

Prevention — how to keep your dog and family safe

During walks (Jan–Apr)

Keep dogs on a short lead in any pine area, regardless of how clear the path looks.
Scan ahead for caterpillar processions or fallen nest material. Processions are visible from several metres.
Avoid pine-shaded park benches and picnic areas — ground litter holds hairs even after the caterpillars have moved on.
Walk early in the day or after rain when caterpillars are less mobile.
Choose non-pine routes where you can — beach, riverside, urban park, olive grove.

At home

Inspect pine trees on your property monthly Nov–Feb. Catch nests early and have them removed before processions start.
Pheromone traps — deployed in July–September, these catch the male moths and reduce next year’s egg load. Available from any Spanish agricultural supplier; cost around €30–€60 per trap.
Tape and trap barriers — physical adhesive collars fitted around the pine trunk catch caterpillars during descent, preventing ground exposure. Effective for one season, fitted Dec–Jan.
Biological control (BTk) — a sprayed application of Bacillus thuringiensis kurstaki kills early-instar caterpillars in the nest. Best applied Oct–Nov by a professional with permission to spray neighbour-overhanging branches.
Endotherapy — trunk-injected systemic insecticide, mostly used on mature ornamental pines in town centres. Effective but specialist work.

Town hall nest-removal services

Spanish municipalities (ayuntamientos) are obliged to control processionary in public spaces and many will remove nests on private land that overhang public areas. In the Costa Blanca:

Jávea, Calpe, Moraira, Dénia, Altea, Benidorm — report nests via the town hall app or 010 line. Removal is typically scheduled Dec–Feb.
Torrevieja, Orihuela Costa, Pilar de la Horadada — coordinated regional programmes; some urbanisations contract private firms directly.
Larger town parks and pinewoods are usually treated by professional contractors using BTk or pheromone traps; signage marks treatment areas.

For nests on your own land that don’t overhang public space, hire a licensed pest-control firm. Quoted prices on the Costa Blanca run €60–€120 per tree for ground-accessible nests, more for tall canopy work or rope-access removal.

Climate change and the spread of the pine processionary

Two decades of warming Mediterranean winters have measurably extended the pine processionary’s range. Spanish forestry research (INIA, MITECO and the universities of Valladolid and Madrid) documents:

Northward expansion into the Cantabrian foothills and parts of Galicia where the species was rare in the 1990s.
Altitudinal expansion — the caterpillar now successfully overwinters at altitudes above 1,600 m in the Sistema Central, where historic limits were closer to 1,200 m.
Earlier procession dates — coastal Mediterranean processions now start in late December rather than late January, shortening the “safe” dog-walking window.
Outbreak intensification — warmer dry summers stress pine forests and increase population peaks every 8–11 years.

For dog owners, the practical implication is straightforward: treat November to April as the at-risk season, monitor your local AEMET weather and start dog-safety routines a month earlier than the historical norm.

How pet insurance helps with the vet bill

Emergency treatment for processionary poisoning — the consultation, sedated lavage, medication, hospitalisation and any surgery — is exactly what a pet policy’s vet-fee cover is designed for. Spain also now requires dog third-party liability insurance under Ley 7/2023, in force since September 2023, and a full pet policy adds the vet-fee protection on top. As authorised Generali agents in Jávea, we arrange pet insurance for dogs and cats across Spain, in English — including 24-hour vet helplines for processionary, snake-bite, heat-stroke and other Costa Blanca seasonal emergencies. Read our pet insurance guide, contact us or call 966 461 625.

Frequently asked questions

Yes — they are extremely dangerous and contact is a veterinary emergency. Their barbed hairs release a toxin that causes intense swelling and tissue death. A dog that licks or mouths one can lose part of its tongue, and without fast treatment it can be fatal.

Their white silk nests are visible in pine trees through autumn and winter. The caterpillars descend in head-to-tail processions, usually between late January and April depending on the weather — warmer winters bring them down earlier. They are most dangerous on the ground during this descent.

Treat it as an emergency and go to a vet immediately. While preparing to travel, rinse the dog’s mouth repeatedly with warm water, wearing gloves and being careful not to rub (which spreads the hairs). Do not let the dog lick the area. Time matters — the toxin works fast.

Yes. The hairs cause itchy skin rashes, eye irritation and, if inhaled, breathing difficulties. Reactions can be severe in children and in anyone allergic. Never touch the caterpillars or their nests with bare hands, and keep children well away.

A pet policy with vet-fee cover is designed for exactly this kind of accidental emergency — the consultation, treatment and any follow-up care. Cover and limits vary, so check the vet-fee limit when you take out the policy. Turner Insurance can arrange Generali pet cover in English.

Do not remove a nest yourself — disturbing it releases clouds of airborne hairs that are hazardous to people and pets. Use a professional pest-control company or your local council, which handle nest removal and tree treatment safely.

The pine processionary moth (Thaumetopoea pityocampa) is a small drab grey-brown moth, active July–September, that lays its eggs in spiral bands on pine needles. The eggs hatch into the caterpillars that build silk nests over autumn and winter and descend in head-to-tail processions in late winter/spring. The adult moth itself does not bite or sting; the danger is the caterpillar.

A mature pine processionary caterpillar is 3–4 cm long, brown-orange on the back with cream-coloured sides, covered in tiny brown urticating hairs. They are most often seen nose-to-tail in long ground processions — the unmistakable identification cue. The silk nests are dense white cotton-wool clumps in pine tree branches.

The classic signs appear within minutes: sudden profuse drooling, pawing at the mouth, restlessness, and visible swelling of the tongue, lips and muzzle. The tongue may turn bright red, then darken at the edges. Any of these signs during caterpillar season (Dec–Apr) should be treated as a presumed exposure and a veterinary emergency.

With prompt veterinary treatment, most dogs survive a processionary encounter. The factors that worsen the prognosis are: delay in starting treatment, multiple-caterpillar exposure, the dog actually swallowing one, and prior exposures (which sensitise the immune system). Survival rates above 90% are typical with treatment in the first hour; mortality rises sharply if treatment is delayed beyond 6 hours.

Mild cases (early treatment, no necrosis) typically run €120–€220 on the Costa Blanca. Moderate cases requiring sedated lavage and overnight observation cost €300–€600. Severe cases with tongue necrosis surgery and multi-day hospitalisation can exceed €800–€1,800. Out-of-hours surcharges add 40–70%. A pet insurance policy with vet-fee cover pays directly.

The lowest-risk months on the Costa Blanca and across Mediterranean Spain are May to October, when the caterpillars are buried as pupae in soil and the active moths cannot harm dogs. Risk rises sharply from November as the new generation feeds in nests; the absolute peak is January to April when processions cross the ground.

The pine processionary moth is native to the Mediterranean basin and is widespread in Portugal, Spain, southern France, Italy, the Balkans, Turkey, North Africa and parts of the Middle East. Climate change has extended its range northward into northern France, the southern UK (Channel coast, small populations), and to higher altitudes within mainland Spain.

In Spanish the species is called oruga procesionaria del pino or simply procesionaria del pino. The Spanish name for the moth is mariposa de la procesionaria del pino. If you need to tell a vet, say “mi perro ha tocado procesionaria” — “my dog has touched processionary”.

Sources & references

Ministerio para la Transición Ecológica (MITECO) — official Spanish information on procesionaria del pino and forest health.
Ley 7/2023 (BOE) — the Animal Welfare Law and mandatory dog liability cover.
INIA — Instituto Nacional de Investigación Agraria — entomological research on Thaumetopoea pityocampa.
AEMET — Spanish meteorological data underpinning seasonal forecasts.
Colegio Oficial de Farmacéuticos — first-aid guidance for human contact.
Consejo General de Colegios Veterinarios de España — veterinary treatment protocols.

Related guides & insurance

Spanish pet insurance (Generali Mascotas) — vet-fee, third-party liability and lost-pet cover.
Pet Insurance Spain — Expat Guide
Sunstroke in Spain — first-aid guide for dogs and humans
Emergency Numbers in Spain (112 and more)
Moving to the Costa Blanca — 2026 Expat Guide
Can You Drink Tap Water in Spain? — Safety by Region
Home insurance Spain — 24-hour assistance includes locksmith, plumbing, glazing.
Private health insurance Spain — for the human side of processionary exposure.

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This guide is general information, not veterinary or personalised advice. If you suspect your pet has touched a processionary caterpillar, contact a vet immediately. Cover and limits vary — for advice on pet insurance, contact Turner Insurance.