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Yes. Adders are venomous, and any suspected bite needs urgent professional help: call 999 or go to A&E for a person, and contact a vet urgently for a dog or cat. Keep the bitten person or animal still, do not handle the snake, and do not wait for severe symptoms to appear.
What makes an adder bite urgent?
The adder is the only venomous snake found in the wild in the UK. The NHS describes it as grey or reddish-brown, with a dark zigzag stripe along its back. The NHS also advises getting all snake bites checked as soon as possible, whether or not the snake was identified. NHS guidance on snake bites was last reviewed on 17 July 2026.
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Do not approach, catch or kill a snake to identify it or take a photograph. If you can safely remember its appearance or take a picture from a distance, that may help clinicians, but your safety comes first.
If a person may have been bitten
Call 999 or go to A&E immediately. The NHS advises emergency assessment after any suspected snake bite. While help is being arranged:
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- Stay calm and keep the bitten body part as still as possible.
- Lie in the recovery position if possible.
- Remove nearby jewellery and loosen clothing in case swelling develops.
- Take paracetamol for pain if needed; do not take aspirin or ibuprofen for the bite because they can make bleeding worse.
- Remember the snake’s appearance, or take a photograph from a safe distance only if you can do so without approaching it.
Do not cut the bite, suck out venom, tie a tight bandage or ligature around the bitten part, or go near the snake. The RSPCA also advises keeping the limb still and going to A&E; it says to call an ambulance if the person loses consciousness. Hospital observation is usually at least 24 hours. Treatment may include wound care, tetanus protection and antivenom for a venomous bite. RSPCA advice on living with reptiles provides additional guidance.
If a dog or cat may have been bitten
Contact a veterinary practice urgently and arrange an examination, even if the animal seems well. Keep the pet quiet and still, leave the bite alone, and tell the vet you are coming. For a dog, PDSA advises carrying it or bringing the car to it if practical, to minimise movement. Do not apply a bandage or tourniquet, search for the snake, or try home treatment instead of veterinary care. The RSPCA’s advice applies to pets generally: a suspected bite needs urgent veterinary examination.
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Face and neck bites are especially concerning in dogs because swelling can affect breathing. Do not wait for severe symptoms before calling a vet.
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Possible signs in dogs
PDSA says symptoms may begin within a couple of minutes to an hour. Signs and severity vary; a dog may show one or more of the following:
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- Effective Bee and Wasp Sting Relief: This bee sting kit can be helpful in extracting bee, wasp or spider venom from the wound site, and the pump is easy to use even with only one hand
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- Reliable First Aid Tool: Ven-Ex snake bite kit by Archer MedTech is a sturdy, reliable First Aid tool for extracting subcutaneous venom from snake bites, bee stings, wasp stings, and similar injuries. Note, venom extractors work well to pull venom from just beneath the skin but not from within the muscle tissue. Effectiveness will vary depending upon where the bite or sting occurred and how deep it is. Always seek professional medical attention immediately
- Milder signs: pain and swelling around the bite, limping after a leg bite, or small bite marks.
- More serious signs: vomiting, diarrhoea, pale gums, panting or drooling.
- Very severe signs: weakness or wobbling, face or neck swelling, severe bruising or abnormal bleeding, tremors or seizures, difficulty breathing, or collapse.
Sudden death can occur if venom enters the bloodstream directly, according to PDSA. Animal PoisonLine also lists progressive local swelling, pain, lethargy, collapse, vomiting, panting, lameness, bruising and bleeding as possible signs. PDSA guidance on snake bites in dogs and Animal PoisonLine’s adder-bite advice give further detail.
What to know about cats
The available guidance does not provide a detailed cat-specific symptom list or separate first-aid protocol. Do not use the dog symptom list to rule out a bite in a cat. If a cat may have been bitten, contact a veterinary practice urgently and follow the clinician’s instructions.
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- Easy to use：This bee sting kit can be helpful helpful in extracting bee, wasp or spider venom from the wound site. The pump is easy to use even with only one hand.Just need to press the bar to the bottom to absorb venom, DO NOT REPEAT IT!
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- Ask for medical advice immediately：Snake bite kit is a sturdy, reliable First Aid tool for extracting subcutaneous venom from snake bites, bee stings, wasp stings,Absorbing pus in the wound， etc. Note, venom extractors work well to pull venom from just beneath the skin but not from within the muscle tissue. Effectiveness will vary depending upon where the bite/sting occurred and how deep it is. Always seek professional medical attention immediately.
How to reduce the chance of an encounter
Adders should be left alone. Keep children and pets away if you see one, and do not try to move it. PDSA identifies long grass, woodland, moorland and coastal areas such as sand dunes or coastal paths as places where adders are commonly found. Its guidance says adders are active from February to October and dog bites are especially common from June to August; these are seasonal observations, not a guarantee that encounters cannot happen at other times. PDSA’s dog guidance also says bites commonly affect the face, neck or lower leg.
Quick Recap
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- Keep a bite and sting extractor kit handy for all of your outdoor activities. It's a handy addition to your First Aid Supplies, car glovebox, backpack, etc. Rattlesnake Bite Kit is essential for backcountry camping, fishing, hiking or just a day at the local park
- This bee sting kit can be helpful helpful in extracting bee, wasp or spider venom from the wound site. The pump is easy to use even with only one hand
- Venom extractor includes four sizes of extraction vessels that attach to the pump handle. Choose the size that best suits your current needs. As a rattle snake bite kit, bee sting kit and venom extractor this versatility is essential
- Snake bite kit is light, compact and highly portable. It comes in a hard-shell case with four sizes of extraction cups and a tourniquet band to help control the spread of the venom until it can be extracted
- Snake bite kit by WAEKIYTL is a sturdy, reliable First Aid tool for extracting subcutaneous venom from snake bites, bee stings, wasp stings, etc. Note, venom extractors work well to pull venom from just beneath the skin but not from within the muscle tissue. Effectiveness will vary depending upon where the bite/sting occurred and how deep it is. Always seek professional medical attention immediately
- Keep dogs on paths and on a lead in known adder areas.
- Keep pets away from snakes and do not let them investigate.
- If you suspect a bite despite these precautions, arrange emergency or veterinary help rather than waiting to see whether symptoms develop.
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