Can dogs eat aleve (naproxen)?
If your dog has just eaten aleve (naproxen)
Do this now
- Call your vet or ASPCA (888) 426-4435 immediately
- Bring the bottle — strength varies (standard 220 mg, prescription up to 500 mg)
- Do NOT induce vomiting without vet instruction
- Emphasize to your vet this is NAPROXEN not ibuprofen — longer monitoring needed
- Expect multi-day hospitalization for significant ingestion
- Watch for: vomiting, black tarry stool, refusing food, weakness, decreased urination
What your vet will want to know
Have this information ready when you call:
- Exact strength (220 mg OTC, 375-500 mg prescription)
- Number of tablets
- Time of ingestion
- Your dog's weight
- Any vomiting or symptoms
The full picture
Naproxen is the most dangerous common OTC NSAID for dogs — not because the initial toxicity is higher than ibuprofen, but because it has a dramatically longer half-life in dogs (74 hours vs humans' 12-17 hours). This means damage accumulates for days after a single dose. Toxicity profile is similar to ibuprofen: severe stomach ulcers, intestinal perforation, acute kidney injury, potential liver damage. But the extended action means vets often need to monitor for 4-7 days after exposure, not 24-72 hours as with ibuprofen. A single 220 mg Aleve tablet can cause serious ulcers in a 50 lb dog. Smaller dogs can be severely poisoned by half a tablet. There is absolutely no reason to give naproxen to a dog under any circumstances.
Only your vet should make this call. If you can't reach them, our 4-gate safety checker walks through when hydrogen peroxide is appropriate (and when it's dangerous — sharp objects, caustics, certain breeds, and more).
Check if vomiting is safe →Risks to watch for
- Severe GI ulcers (longer-lasting than ibuprofen)
- Intestinal perforation
- Acute kidney injury (often irreversible)
- Liver damage at high doses
- GI bleeding
- Long damage duration due to 74-hour half-life
Symptom timeline
Symptoms typically progress in stages. Knowing what to expect helps you act fast:
- 2–12 hours Vomiting, abdominal pain
- 12–48 hours GI ulcers: bloody vomit, melena (black stool)
- 2–5 days Extended damage window: kidney injury, continued GI effects
- 5–7 days Late complications; monitoring still important
Breed-specific warnings
- Small dogs fatally poisoned by single tablet.
- The extended half-life makes naproxen especially dangerous for dogs with pre-existing kidney issues.
Safe portion size
None ever.
Safer alternatives
- Dog-specific prescription NSAIDs only
Common questions
Why is naproxen worse than ibuprofen for dogs?
Half-life. Ibuprofen clears in about 6-12 hours in a dog; naproxen takes 74 hours. This means a single dose causes damage for much longer, and repeat doses accumulate catastrophically.
My dog ate half an Aleve — is that an emergency?
Yes. Even 100 mg can cause serious ulcers in a medium dog, and smaller dogs face immediate kidney risk. Call your vet immediately.
How is naproxen treated?
Similar to ibuprofen — IV fluids, GI protectants, monitoring kidney and liver — but for a LONGER period. Expect 3-5 days of hospitalization for significant ingestion. Cost: $2,000-$6,000+.
Are there any veterinary uses for naproxen?
Essentially none. Dog-specific NSAIDs have much better safety profiles and are always preferred. No legitimate reason exists to give a dog naproxen.
Unexpected vet bills can run into thousands
One emergency visit for food poisoning can cost $500–$10,000+. Compare US pet insurance in 60 seconds.
Learn about vet costs & insurance →Sources
The information on this page is compiled and cross-checked against these authoritative US veterinary and toxicology sources:
- ASPCA Animal Poison Control Center — 24/7 poison hotline and comprehensive toxic food database
- Pet Poison Helpline — veterinary toxicology service
- Merck Veterinary Manual — peer-reviewed clinical reference
- American Veterinary Medical Association (AVMA)
- American Kennel Club Expert Advice
- Cornell University College of Veterinary Medicine
Specific toxicity thresholds cited on this page come from the above sources; where they disagree, we cite the more conservative figure. Numbers are general guidance — individual dogs vary in sensitivity based on age, breed, medications, and health conditions. When in doubt, always call your vet.
Checked against US veterinary guidance — see our editorial standards and source list. If your dog has eaten something and you need urgent advice, call a vet or the ASPCA Animal Poison Control Center on (888) 426-4435.