PupkeeperCaution
Oak processionary caterpillars and dogs: what to do
Caution. The hairs of oak processionary caterpillars and their nests can cause blistering, tongue and eye irritation, and sometimes breathing trouble.
If your dog ate or touched this, call your vet or a pet poison line now
United States
Poison lines in other countries: United Kingdom, Australia, Canada, New Zealand
What to do now
- Call your vet or a pet poison line now.
- Move your dog away from the caterpillars and nests.
- Go to a vet right away if your dog has trouble breathing.
Don't
- Don't touch the caterpillars, hairs or nests, or try to remove nests yourself.
Signs to watch for
- Itchy rash or blisters
- Tongue irritation
- Eye irritation
- Throat irritation
- Breathing difficulties (occasionally)
Why
The caterpillars are covered in long hairs containing irritating proteins, and their nests hold the hairs too. They live on oak trees in parts of England.
Sources
- GOV.UK (Forestry Commission): Oak Processionary Moth Warning
- Buckinghamshire Council: Oak Processionary Moth
Guide reviewed 9 October 2026.
General information from the sources above, not a diagnosis. When in doubt, call your vet.