By Dial A Vet Veterinary Team
When a dog is limping, crying out, or refusing to settle, the urge to reach into the household medicine cabinet is understandable. It is also one of the most common ways dogs end up poisoned. Many human painkillers, including ibuprofen, naproxen, aspirin, and paracetamol, can cause stomach ulcers, kidney injury, or liver damage in dogs, sometimes after a single tablet. This page explains, in general terms, how veterinarians approach pain in dogs and why every medication decision belongs with the vet treating your dog. If arthritis is the reason you are here, our page on arthritis in dogs covers long-term management in more detail.
Key takeaways
- Never give a dog human pain relief such as ibuprofen, naproxen, aspirin, or paracetamol unless your own vet has specifically told you to.
- Vets choose pain relief based on the cause of pain, the dog's age, kidney and liver health, other medications, and how long treatment is likely to last.
- Veterinary pain medicines are not interchangeable. Two drugs from the same family can be dangerous when given together or too close together.
- Good pain control often combines medication with weight management, controlled exercise, physiotherapy, and changes at home.
- Vomiting, black or tarry stools, increased thirst, yellow gums, or collapse after any medication is an emergency.
Why human painkillers are dangerous for dogs
Dogs process drugs differently from people. Ibuprofen and naproxen are non-steroidal anti-inflammatory drugs (NSAIDs) made for human physiology, and dogs are far more sensitive to their effects on the stomach lining and kidneys. A dose that seems small, such as one tablet for a medium-sized dog, can cause bleeding ulcers or acute kidney injury. Naproxen stays in a dog's system for a long time, which makes toxicity more likely.
Paracetamol (acetaminophen) is sometimes assumed to be the "gentle" option because it is gentle on human stomachs. In dogs it can damage the liver and red blood cells, and in cats even a small amount can be fatal. Combination cold and flu tablets add decongestants and other ingredients that bring their own risks. Aspirin is sometimes mentioned online as safe for dogs, but it can still cause ulcers and it interferes with other treatments a vet may want to use later.
The other problem is timing. If a dog has had a human NSAID at home, a vet usually cannot safely start a veterinary anti-inflammatory straight away. A well-meant tablet can delay proper pain relief.
What vets commonly use, in general terms
Veterinary pain management is built around the type of pain (sudden injury, surgery, long-term joint disease, nerve pain, cancer) and the individual dog. Broadly, the categories a vet may discuss include:
- Veterinary NSAIDs. Anti-inflammatories formulated and registered for dogs. They are widely used for arthritis and after surgery, and vets usually recommend blood tests before and during long-term use to monitor kidney and liver function.
- Opioids and related drugs. Used mainly in hospital, around surgery, or for severe pain, with careful monitoring.
- Medications for nerve or chronic pain. Some drugs that act on the nervous system are used alongside anti-inflammatories when pain has become persistent or "wound up".
- Newer arthritis treatments. These include injectable therapies aimed at the pain pathway in osteoarthritis, given at the clinic.
- Local anaesthetic techniques. Used during surgery and dental work to block pain at the source.
Which of these suits your dog, at what dose and for how long, is a clinical decision. Your vet will weigh the benefits against side effects and adjust the plan as your dog changes. Please do not use this list to choose a medication, and do not share prescribed pain relief between pets in the same household.
Signs your dog may be in pain
Dogs often hide pain, particularly when it builds slowly. Watch for:
- Limping, stiffness after rest, or reluctance to jump into the car or onto the couch
- Panting or restlessness at night, trouble getting comfortable
- Licking or chewing at one spot, often a joint
- A hunched posture, guarding the belly, or yelping when picked up
- Grumpiness, hiding, or snapping when touched in a particular area
- Reduced appetite or less interest in walks and play
When it is urgent
Go to an emergency veterinary hospital straight away if your dog:
- Has swallowed any human painkiller, even if they seem fine. Bring the packet so the team knows the product and strength.
- Is vomiting (especially blood or "coffee grounds"), has black tarry stools, or has stopped eating after starting any medication
- Cannot stand, is dragging the back legs, or has sudden severe pain in the back or neck
- Has a swollen, hard, painful belly, pale gums, or is collapsing
- Has been hit by a car or had a fall, even if they walk away
Back pain with wobbliness can signal disc disease, which our page on disc disease in dogs explains. Do not wait to see if pain settles overnight in these situations.
How vets assess pain
A vet will usually take a history (when the pain started, what makes it worse, any medications already given), examine the dog from nose to tail, and feel joints, spine, and belly. Validated pain scoring tools help track improvement over time. Blood and urine tests check that the kidneys and liver can safely handle medication. X-rays or other imaging may be recommended to find the cause. Pain relief works best when the cause is identified, so a consult is about more than a prescription.
Supporting a dog in pain at home
- Give only medications prescribed for that dog, exactly as directed, and finish or stop courses only on your vet's advice.
- Keep human medicines in closed cupboards. Dogs chew through blister packs and handbags.
- Provide a soft, supportive bed away from draughts, and non-slip mats on tiled or timber floors.
- Keep your dog lean. Extra weight adds daily load on sore joints.
- Use short, regular walks rather than one long weekend outing, unless your vet has advised strict rest.
- Ask about physiotherapy, hydrotherapy, or a rehabilitation vet for chronic pain.
- Report any vomiting, diarrhoea, drinking more, or appetite change while on medication.
FAQ
Can I give my dog half a human ibuprofen?
No. There is no safe "half dose" you can work out at home. Ibuprofen can cause ulcers and kidney damage in dogs. If your dog has already had some, contact an emergency vet now.
Are natural or herbal pain remedies safe?
Some supplements, such as omega-3 fatty acids, have reasonable evidence as part of an arthritis plan. Others have little evidence or can interact with medications. Check with your vet before adding anything.
Why does my vet want blood tests before pain medication?
Many pain relievers are processed by the liver and kidneys. Baseline and follow-up tests help your vet choose a safe option and pick up side effects early.
Can an online vet help with pain?
A video consult can help you judge how urgent the problem is, talk through signs, and plan next steps. Prescribing usually depends on an examination and local regulations, so your vet may recommend an in-clinic visit.
Talk with a vet
If your dog seems sore and you are not sure how serious it is, our vets can talk it through with you by video and help you decide on next steps. Book a consult at dialavet.com. If your dog has swallowed a human medication, cannot walk, or is collapsing, go to your nearest emergency vet hospital instead.
References
- Monteiro BP, et al. 2022 WSAVA Guidelines for the Recognition, Assessment and Treatment of Pain. Journal of Small Animal Practice.
- Gruen ME, et al. 2022 AAHA Pain Management Guidelines for Dogs and Cats. American Animal Hospital Association.
- Merck Veterinary Manual. Nonsteroidal Anti-inflammatory Drugs in Animals; Toxicities from Human Drugs.
Disclaimer: Educational only. This page does not replace an examination or advice from your own veterinarian, and it is not a guide to choosing or dosing medication. If your pet is unwell or has swallowed a medication, contact a veterinary hospital promptly.
