Adder Bites in Dogs: What Every UK Dog Owner Needs to Know

Every year in the UK, dogs are bitten by adders while out enjoying walks in the countryside. While these encounters are relatively rare, they can be serious—and in some cases, life-threatening—if not handled quickly.

Understanding where and when adders are active, recognising the signs of a bite, and knowing what to do in those crucial first moments could make all the difference for your dog.

What is an adder?

The adder is the UK’s only native venomous snake. They are typically shy and will avoid confrontation, but they may bite if startled, threatened, or accidentally stepped on—something curious dogs are particularly prone to.

Adders are most active between early spring and October, with peak activity from April to July. This is when they emerge from hibernation and are more vulnerable, which can make them more defensive.

Where are adders found?

If you regularly walk your dog in rural or semi-rural areas, it’s worth being aware of common adder habitats. These include:

• Woodland and forest edges

• Moorland and heathland

• Sand dunes and coastal paths

• Sunny hillsides and grassy clearings

They often bask in warm, open spots—especially during cooler parts of the day—making them easier to accidentally disturb.

When are dogs most at risk?

Adder bites are more likely to occur:

• In the afternoon (around 3–4pm) when temperatures are warmer

• In early spring, when snakes are newly active and less alert

• When dogs are off-lead and exploring undergrowth

Curious sniffing is one of the most common ways dogs get bitten, usually on the face, neck, or legs.

Signs your dog may have been bitten

Symptoms can appear quickly, often within minutes. In some cases, they may worsen over several hours.

Look out for:

• Sudden swelling around the bite site

• Limping or signs of pain

• Two small puncture wounds (not always easy to see)

• Redness, bruising, or bleeding

• Drooling or vomiting

• Lethargy or weakness

• Rapid breathing or increased heart rate

Even if you’re unsure, it’s always safer to assume it could be an adder bite and act accordingly.

What to do if your dog is bitten

If you suspect an adder bite, your priority is to stay calm and act quickly.

1. Stay calm

Dogs can pick up on your stress, which may increase their heart rate and spread venom more quickly.

2. Call your vet immediately

Let them know you’re on your way so they can prepare.

3. Keep your dog still

Movement can accelerate the spread of venom through the body.

4. Carry your dog if possible

Avoid letting them walk, even if they seem able to.

5. Check the bite area

Look for swelling or puncture wounds, usually on the legs or paws.

Why fast treatment matters

The good news is that most dogs recover well with prompt veterinary treatment. Your vet may provide:

• Pain relief

• Anti-inflammatory medication

• Intravenous fluids

• Monitoring for complications

• In some cases, antivenom

Delays in treatment can increase the risk of more serious effects, so it’s always better to air on the side of caution.

Can adder bites be prevented?

While you can’t eliminate the risk entirely, you can reduce it:

• Keep your dog on a lead in known adder habitats during peak seasons

• Stick to well-trodden paths

• Avoid letting your dog explore dense undergrowth

• Be extra cautious on warm, sunny days

Final thoughts

Adder bites are understandably frightening, but being prepared can make all the difference. Knowing the signs, staying calm, and acting quickly gives your dog the best possible chance of a full recovery.

If you walk your dog in the countryside, it’s worth saving or sharing this information—you never know when it might help.