Warnung von Tierärzten: Diese Zutat sollten Sie immer dabeihaben, um Ihren Hund vor Prozessionsspinnerraupen zu schützen

The Sunday walk was supposed to be idyllic. Soft light, quiet forest trail, your dog trotting a few meters ahead, tail high, nose in the leaves. Then, suddenly, he stops, sniffs a strange grey “carpet” hanging low in a pine, and before you can react, he’s licked the ground where tiny hairs are scattered. Ten minutes later, he starts drooling. His tongue swells. He rubs his muzzle frantically in the grass. Your heart races, your fingers shake on your phone as you try to call the vet. The car feels very far away. The vet clinic even further.
On that kind of day, one tiny object in your pocket can change everything.
And most dog owners still don’t have it.

Warum Tierärzte plötzlich so laut vor Prozessionsspinnern warnen

Across Germany, vets are reporting the same story again and again. Spring arrives, the first warm days call people to the woods, and the phones in clinics start ringing off the hook. Dogs with swollen tongues, burned lips, red eyes, shortness of breath. The common thread? Pine or oak processionary caterpillars and their microscopic, venomous hairs that spread on the ground, on bark, and even blow through the air.
What looks like a fuzzy grey line on a tree can become a nightmare for your dog in seconds.
And for you, a race against time.

One Berlin vet spoke of a Labrador who only sniffed briefly at a nest at the edge of a popular walking path. No licking, no chewing, just that typical curious inhale. Within twenty minutes the dog’s tongue was the size of a sausage. The owner rushed him to the clinic, panicked, certain he would suffocate on the way.
The team managed to save the tongue, but only just. In other cases, parts of the tongue literally die off and need to be removed surgically. A “simple” spring walk then ends in weeks of pain, special food and high bills.

What makes processionary caterpillars so treacherous is not only the venom in their hairs. It’s also their invisibility. The hairs stick to pine needles, lie in the dust, float in low grass where dogs sniff and pant. Your dog doesn’t need to touch the nest itself.
Even the ground several meters away can be contaminated. One quick lick over a paw, one curious taste of a pinecone lying nearby, and the poison is in direct contact with the mucous membranes. No warning sign, no siren. Just a normal walk, and then chaos.

Die eine Zutat, die Tierärzte empfehlen – und wie Sie sie nutzen

Across several German clinics, vets are now giving the same, rather simple recommendation: always carry a small bottle of sterile saline solution when you walk your dog in risky areas. Not eye drops with additives, not homemade salt water from the tap. Just plain sterile NaCl solution from the pharmacy or pet store.
This is the “ingredient” that can buy you precious minutes.
If your dog sniffs or licks where processionary caterpillars have been, you can immediately start rinsing the mouth and tongue and dilute the venomous hairs.

We’ve all been there, that moment when you think, “I’ll just take the dog out for ten minutes, I don’t need anything with me.” No leash bag, no water, certainly no saline. And then the path leads through a line of pines where warning signs were put up last year. You walk faster, you call your dog, you hope for the best.
Let’s be honest: nobody really carries a full first-aid kit every single day. Yet one 100 ml bottle of saline weighs less than your keyring and costs less than many dog treats. It slips in a jacket pocket and can mean the difference between an irritated tongue and an emergency surgery.

“If owners rinsed their dog’s mouth immediately, we’d see far fewer necrotic tongues,” explains a Munich emergency vet. “Saline doesn’t neutralise the venom, but it mechanically flushes out a lot of the hairs before they can fully embed in the tissue.”

To use it, you don’t need any special medical skills. You can:

Gently hold your dog’s head sideways and pour the saline from the side of the mouth, so it flows out the other side.
Rinse the tongue, lips and gums for as long as the bottle lasts, even if your dog protests.
Afterwards, call a vet immediately and drive to the clinic, even if the dog seems a bit better.
Also rinse the eyes with saline if they are red or your dog rubs them after contact near a nest.
Always tell the vet you suspect processionary caterpillars, so they can prepare the right treatment.

Mehr als nur eine Flasche im Rucksack

Once you’ve had this bottle in your pocket a few times, something shifts in your head. You start looking at pine and oak trees differently. You recognise the long, greyish caterpillar “trails” on the trunks, the abandoned nests that cling like dirty cotton to the branches, the red warning tape some municipalities now put up.
You also notice how many other dog owners walk past all this without a clue, chatting, headphones on, dogs off leash and noses in every bush.

Key point	Detail	Value for the reader
Always carry saline solution	Sterile NaCl 0,9 %, small bottle, in every walk bag	Immediate first aid if your dog contacts processionary hairs
Recognise risk zones	Pine/oak forests, city parks with warning signs, sandy paths under conifers	Fewer surprise encounters, safer route choices
Act fast, then see a vet	Rinse, keep the dog calm, call clinic, drive in	Reduces severity of burns and chance of tongue amputation

FAQ:

Question 1What are the first signs that my dog may have come into contact with processionary caterpillars?

Answer 1Typical signs include sudden intense drooling, pawing at the mouth, swelling of lips or tongue, refusal to eat, and sometimes vomiting or restlessness. Red or swollen eyes after a walk near pines or oaks can also be a warning.

Question 2Can I also rinse with tap water if I don’t have saline with me?

Answer 2Yes, if tap water is all you have, *use it rather than doing nothing*. The advantage of sterile saline is that it’s gentle on eyes and mucous membranes and easy to handle on the go, but any clean water helps to flush out hairs.

Question 3Is my dog safe if he only walked under trees with nests and didn’t sniff directly at them?

Answer 3Not completely. The hairs can fall to the ground or be blown several meters away. That’s why vets recommend extra caution, a shorter leash and avoiding clearly infested areas during the peak season.

Question 4Are some dog breeds more at risk than others?

Answer 4Curious, nose-driven breeds and young dogs that lick and taste everything are more often affected. Long-haired dogs can also bring hairs home in their fur, which can then irritate human skin.

Question 5What should I prepare at home for the processionary season?

Answer 5Have one bottle of saline in your walk bag and one in the car, store the number of the nearest emergency vet in your phone, and check local warnings from your town or forestry service. A quick talk with your vet about your usual routes is also a good idea.