Head & Paws · Canada
Processionary caterpillars
Suspected contact, particularly with the mouth or eyes, needs prompt veterinary advice. Breathing difficulty is an emergency.
All outdoor hazardsWhat to do now — and avoid
Move away and call the vet. Prevent further contact and licking where safe. Avoid rubbing affected tissues or handling hairs with bare hands. Ask the vet for exposure-specific cleaning instructions; do not force water into the mouth or delay transport to attempt removal.
Signs to watch for
Drooling, oral pain, swelling, eye irritation or breathing problems after contact warrant rapid help.
Where you might encounter it
Pine and oak processionary caterpillars are relevant in France; oak processionary moth is managed in affected parts of England. Detached hairs and old nests can remain hazardous. Do not use month or absence of visible caterpillars to rule out exposure.
Prevention
Keep away from caterpillars and nests, including fallen nests. Follow local closures; never brush, handle or attempt to remove them yourself.
What veterinary care may involve
Rapid assessment matters because mouth tissues can be seriously damaged. A clinician determines decontamination and supportive treatment.
Near You
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Broad regions are planning aids, not hazard boundaries or live alerts. Species, seasons, weather and local closures vary. No result or missing warning is a guarantee of safety. Language does not change the country.
Canada
Check the province or territory and the individual park before setting out. Parks Canada’s bear-country advice includes physical control of dogs and considering leaving them with safe care. It is not a rule for every Canadian space. Local wildlife encounters, water alerts and winter conditions need destination-specific checks.
How we use evidence
We use veterinary and official sources for the claims they support. Regional notes are conservative editorial signposting, not measured risk scores. Where advice depends on species, equipment or exposure, we say so rather than combine incompatible first-aid instructions. Local prevalence, antivenom stocks and individual service availability are not verified here.
Related guidance
Sources and evidence limits
- ANSES · processionary caterpillars — Indexed official/charity text checked; direct page access was restricted.
- Forestry Commission · oak processionary moth
- Parks Canada · safe travel in bear country — Indexed official/charity text checked; direct page access was restricted.
- CDC · harmful algae and animals
Last editorial review: 20 September 2026. Sources checked for this guide, not clinical certification or continuous surveillance. The three language editions share the same reviewed content.
Check local warnings again before each outing. Report a correction to hello@headandpaws.co.uk.