Processionary Caterpillars: What They Are, Why They're Dangerous, and What to Do

7 hours ago
2 min read

Pine processionary caterpillars are a part of life in Spain, and every dog owner should know how to recognize them. Although they may look harmless, they can cause life-threatening injuries to dogs within minutes.

Here's everything you need to know to help keep your dog safe.

Why Are They So Dangerous for Dogs?

Dogs naturally explore the world with their noses and mouths. A long, moving line of fuzzy caterpillars is exactly the kind of thing most dogs can't resist sniffing or investigating.

Young children are often fascinated by them too. Their unusual appearance can make them tempting to touch, which is why many families in Spain teach their children from an early age to never touch processionary caterpillars and to tell an adult if they see one.

Unfortunately, even a quick sniff, lick, or touch can expose both dogs and people to thousands of tiny toxic hairs that can cause severe reactions. For dogs, their natural curiosity can turn an ordinary walk into a medical emergency within minutes.

Dog tongue injury caused by a pine processionary caterpillar

What To Do If Your Dog Touches a Processionary Caterpillar?

1: Keep your dog away

Move your dog away from the caterpillar to prevent further contact.

2: Do not touch the caterpillar

The toxic hairs can also affect humans. Avoid handling the caterpillar with bare hands.

3: Do not rub your dog's mouth

Rubbing can release more toxic hairs and make the reaction worse.

4: Rinse with plenty of water

If possible, gently flush your dog's mouth or the affected area with clean water. Avoid high pressure.

5: Go to the nearest emergency vet immediately

Even if your dog seems okay, don't wait. Symptoms can worsen quickly and early treatment gives the best chance of recovery.

6: If possible, take a photo

If it is safe to do so, take a photo of the caterpillar to help the vet identify the cause.

Keeping Barcelona's Dogs Safe, Together

Every year, members of the DOGS Barcelona community share sightings of processionary caterpillars to help protect other dogs. A simple post can warn hundreds of local dog owners to avoid an area before someone gets hurt.