---
title: "Adder Snake Bites in Dogs UK"
description: "UK guide — the adder is Britain's only venomous snake. Bite causes painful swelling — keep your dog still, do not suck the wound."
url: "https://pethealth.org.uk/health/adder-snake-bite-dogs-uk"
canonical: "https://pethealth.org.uk/health/adder-snake-bite-dogs-uk"
date_published: "2026-06-25"
date_modified: "2026-06-25"
source: "PETHEALTH+"
---

# Adder Snake Bites in Dogs UK

The **adder is the UK's only venomous snake**. Bites cause **painful swelling** — often on the face or leg after dogs disturb basking snakes on heaths and woodland. **Go to a vet immediately** — keep your dog still; do not suck the wound or use ice packs without vet advice.

## What is an adder?

The **European adder** (*Vipera berus*) is the only venomous snake native to Britain. Adders are **shy** and usually bite only when stepped on or investigated by curious dogs.

They are found on:

- **Heathland and moorland**
- Woodland edges and sandy dunes
- Rough grassland in spring and summer

Adders are **legally protected** in the UK — do not attempt to kill or capture the snake.

## How adder bites happen

Most UK dog bites occur when dogs:

- Sniff under **heather, bracken, or logs**
- Chase movement in long grass
- Put their nose into a basking adder's path

Bites are most common **March to October** when adders are active.

## Symptoms of adder envenomation

Signs usually develop within **minutes to a few hours**:

| Sign | Notes |
|------|-------|
| **Sudden yelp or limping** | At moment of bite |
| **Painful swelling** | Rapidly enlarging around bite site |
| **Bruising and redness** | Spreads from puncture marks |
| **Lethargy & vomiting** | Systemic effects |
| **Pale gums, weakness** | Severe envenomation |
| **Breathing difficulty** | Especially if **face or neck** bitten |

Facial bites are particularly dangerous because swelling can compromise **airways**.

## First aid — what to do

According to the PDSA and Blue Cross:

1. **Keep your dog calm and still** — movement spreads venom faster
2. **Carry small dogs** — minimise walking
3. **Go to a vet immediately** — call your practice or emergency clinic en route
4. **Do not** cut the wound, suck venom, or apply a tourniquet
5. **Do not** give human painkillers — see [ibuprofen poisoning](/health/ibuprofen-poisoning-pets-uk)

If you saw the snake, note **grey-brown zigzag pattern** along the back — helpful for vets but **do not delay** to identify it.

## What your vet will do

Treatment depends on severity:

- **Pain relief** and monitoring
- **Antihistamines and fluids** for swelling and shock
- **Antivenom** — used in some severe UK cases at specialist centres

Most dogs recover with prompt care. Delayed treatment increases complication risk.

## Prevention on UK walks

- Keep dogs on lead in **known adder habitats** during warm weather
- Stay on paths through heathland and dunes
- Train a reliable **recall** before off-lead access to high-risk areas
- Check [seasonal pet care](/seasonal-pet-care) for summer countryside risks

## Adder vs other bites

| Cause | Typical pattern |
|-------|-----------------|
| **Adder** | Rapid painful swelling after countryside walk |
| **Insect sting** | Local swelling — often paw or muzzle; see [pet first aid UK](/health/pet-first-aid-uk) |
| **Paw injury** | Sudden lameness — see [Dog limping causes](/health/dog-limping-causes) |

## Related guides

- [Lyme disease in dogs UK](/health/lyme-disease-dogs-uk)
- [Pet first aid UK](/health/pet-first-aid-uk)
- [When to see an emergency vet](/health/when-to-see-emergency-vet-uk)

## FAQs

### What does an adder bite look like on a dog?

Painful swelling around the bite — often on the face, legs, or nose — develops within hours. Two small puncture marks may be visible. The dog may yelp, limp, or become lethargic.

### Is an adder bite an emergency for dogs?

Yes — all suspected adder bites need urgent veterinary care. Swelling can affect breathing if the face is bitten. Small dogs and puppies are at higher risk of serious reactions.

### What should I do if my dog is bitten by an adder?

Keep your dog calm and still, carry small dogs if possible, do not apply a tourniquet or try to suck venom, and go to your nearest vet immediately. Call ahead if you can.

### Where are adders found in the UK?

Adders live on heathland, moorland, woodland edges, and sand dunes — mainly England, Wales, and Scotland. They are shy and bite when disturbed, often when dogs explore undergrowth.

## Sources

- [PDSA — Adder bites](https://www.pdsa.org.uk/pet-help-and-advice/pet-health-hub)
- [Blue Cross — Adder bites in dogs](https://www.bluecross.org.uk/pet-advice)
- [RSPCA — Wildlife and pets](https://www.rspca.org.uk/adviceandwelfare/wildlife)

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