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My Dog Ate Diclofenac: Immediate Steps and What to Do

PawAI Lab
7 min read

If your dog ate diclofenac, learn the immediate steps to take, what information to gather, and why prompt veterinary contact matters for this toxic human medication.

Quick Answer

If your dog ate diclofenac, contact a veterinarian or animal poison-control service immediately. Diclofenac is a human NSAID that is toxic to dogs and may cause stomach ulcers, kidney damage, and liver injury. Do not induce vomiting or give food, milk, or any medication unless a professional instructs you to. Gather the product packaging and details about how much was eaten and when, so the veterinary team can assess the risk quickly.

Act now. Contact a veterinary professional before using any tool.

  • US: ASPCA Animal Poison Control (888-426-4435) or Pet Poison Helpline (855-764-7661)
  • UK: Animal PoisonLine (01202 509000) or your nearest veterinary emergency clinic
  • Canada: ASPCA Animal Poison Control (888-426-4435) or Pet Poison Helpline (855-764-7661)
  • AU: Animal Emergency Centre or your regular vet
  • EU: Contact your nearest veterinary emergency service

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Safety Verdict

Toxic. Diclofenac is a non-steroidal anti-inflammatory drug (NSAID) made for humans. In dogs it may reduce the protective lining of the stomach and intestines and may decrease blood flow to the kidneys, leading to ulceration and organ injury. Liver effects have also been associated with NSAID exposure. Tablets, capsules, gels, sprays, and patches are all potentially hazardous if ingested, and no safe household dose has been established.

What Should the Owner Do Now?

Take these steps right away:

  1. Contact a veterinarian or animal poison-control service immediately. This is the most important step. Early guidance can help determine whether decontamination or monitoring is needed before serious signs develop.
  2. Remove any remaining product. Pick up spilled tablets, secure the container, and prevent further access. If your dog licked a topical gel or chewed a patch, remove the patch and gently wipe the skin with a damp cloth, then wash your hands.
  3. Do not induce vomiting. Inducing vomiting at home, including with hydrogen peroxide, can be dangerous and should only be done if a veterinarian or poison-control professional directly instructs you to.
  4. Do not give food, milk, oil, salt, charcoal, or any medication. These are not proven protective measures for diclofenac exposure and may complicate treatment.
  5. Gather key information (see the next section) so you can answer the veterinarian's questions accurately.
  6. Follow professional instructions about whether to bring your dog in immediately for examination, blood work, or supportive care.

Even if your dog appears completely normal right now, do not assume the exposure is harmless. NSAID-related injury can develop over several hours, and early intervention generally improves outcomes.

What Signs May Occur?

Signs of diclofenac toxicity may not appear immediately, so the absence of symptoms does not rule out risk. When they do occur, signs may include:

  • Vomiting, sometimes with blood or material resembling coffee grounds
  • Diarrhea, which may be dark or tarry
  • Reduced appetite or refusal to eat
  • Abdominal pain, shown by a hunched posture or restlessness
  • Drooling
  • Increased thirst and urination, or unusually low urine output
  • Lethargy, weakness, or collapse
  • In severe cases, seizures or jaundice (yellowing of the gums or eyes)

If you notice any of these signs, treat the situation as an emergency and seek urgent veterinary care.

What Information Should Be Ready?

Having these details ready can help the veterinary team assess risk and advise you quickly:

  • Dog's details: species, breed, approximate age, and body weight
  • Product: brand or generic name, formulation (tablet, capsule, gel, spray, patch), and strength in milligrams
  • Estimated amount ingested: how many tablets or how much topical product your dog may have consumed
  • Exposure route: swallowed whole, chewed, or licked from skin
  • Time of exposure: when it happened or the window during which it may have occurred
  • Current symptoms: any vomiting, diarrhea, lethargy, or changes in drinking and urination
  • Packaging: the label, box, or tube, including the ingredient list and concentration
  • Medical history: any existing kidney, liver, or gastrointestinal disease and any current medications, especially other NSAIDs or steroids

Provide honest estimates. The veterinary team can work with approximate information to determine the best course of action.

Differences That May Affect Risk

Several factors may influence how seriously diclofenac affects your dog, though none reliably predict the outcome:

  • Body size: Smaller dogs may be at greater risk from a given amount, but larger dogs are not protected from harm.
  • Age and health: Older dogs and those with existing kidney, liver, or gastrointestinal disease may be more vulnerable.
  • Concurrent medications: Dogs already taking NSAIDs or steroids may face a higher risk of stomach ulceration.
  • Formulation: Topical products and patches can still be hazardous, and patches may release drug over a prolonged period.

When to Contact a Veterinarian

Contact a veterinarian or animal poison-control service immediately after any known or suspected diclofenac ingestion. Do not wait for symptoms to appear.

Emergency signs requiring urgent care include:

  • Persistent or bloody vomiting
  • Dark, tarry stools
  • Marked lethargy, weakness, or collapse
  • Significantly increased or decreased urine output
  • Seizures or tremors
  • Yellowing of the gums or eyes

Non-urgent follow-up: If ingestion occurred hours or days ago and your dog seems well, a veterinary examination and blood work are still recommended to check kidney and liver function.

FAQ

What should I do right away if my dog ate diclofenac?

Contact a veterinarian or animal poison-control service immediately. Remove any remaining product, gather the packaging and details about the amount and timing, and do not induce vomiting or give any home remedies unless a professional instructs you to.

How long do I have to act after my dog eats diclofenac?

Treatment is most effective when started soon after ingestion, ideally within the first few hours. Because injury can develop before signs appear, contact a veterinarian right away rather than waiting to see whether symptoms develop.

Will my dog be okay after eating diclofenac?

Outcomes depend on the amount ingested, the dog's size and health, and how quickly treatment begins. Dogs that receive prompt veterinary care generally have better outcomes. A veterinarian can assess the individual situation and recommend an appropriate plan.

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Disclaimer

This article and the PawAI Toxicity Checker provide general safety information and cannot determine an individual pet's toxicity risk or replace a veterinarian or animal poison-control service. If exposure may have occurred, contact an appropriate professional promptly, even if your pet appears well.