Is Naproxen (aleve) safe for Dogs?
✓ Sources checked by the Eaoae Safety Review · 2026-10-28 · Based on 3 sources
No, naproxen (Aleve) is unsafe for dogs. Even one 220 mg tablet can cause stomach ulcers, and as little as 10 mg/kg can trigger acute kidney injury. Its long half-life means symptoms may take days to appear while damage progresses.
🚨 Emergency: Yes — contact your veterinarian immediately.
💡 Why
Naproxen is an NSAID like ibuprofen but with a much longer half-life in dogs, making it disproportionately dangerous. It blocks the prostaglandins that protect the stomach lining and maintain kidney blood flow, causing ulceration, GI bleeding and perforation, and kidney failure. Because it lingers in the body, a single dose can cause days of evolving damage. PPH highlights naproxen as a top NSAID threat precisely because owners underestimate one pill.
🩺 What to do
- Store all NSAIDs in closed cabinets, never on counters.
- If ingestion is suspected, call your vet immediately -- note the dose.
- Do not 'wait and see'; damage progresses over days.
❓ Common questions
Can I give my dog Aleve for pain?
No -- never give human NSAIDs to dogs without explicit veterinary dosing. The safety margins are razor-thin.
What are the signs?
Vomiting (sometimes bloody), bloody or black stools, lethargy, increased thirst, and abdominal pain -- possibly delayed days.
How is it treated?
Decontamination, GI protectants, IV fluids, and days of monitoring given the long half-life.
📚 Sources
- Pet Poison Helpline: Naproxen Toxicity
- Pet Poison Helpline: Naproxen (poison database)
- Toxicoses From Human Analgesics in Animals
- Common Over-the-Counter Toxins in Dogs
- Pet Poison Helpline: NSAIDs
🔎 How the sources compare
What each authority says about Naproxen (Aleve) \u2014 compiled 2026-10-28. Eaoae’s verdict summarizes these sources; it is not our own diagnosis.
| Source | Dogs | Cats | Dose info |
|---|---|---|---|
| ASPCA Animal Poison Control | Not covered | Ibuprofen and naproxen can be quite toxic to cats. If eaten, signs and symptoms can include vomiting, diarrhea, gastrointestinal ulcers and kidney injury; even a small amount of these medications can cause big problems for cats. | — |
| Pet Poison Helpline | Naproxen (Aleve) is named among the NSAIDs that top PPH's list of human medications poisonous to pets: while these medications are safe for people, even one or two pills can cause serious harm to a pet, and dogs may develop significant stomach and intestinal ulcers as well as kidney failure. | Naproxen (Aleve) is named among the NSAIDs that top PPH's list of human medications poisonous to pets: even one or two pills can cause serious harm, and cats may develop significant stomach and intestinal ulcers as well as kidney failure. | Even one or two pills can cause serious harm (no mg/kg figure given) |
| Merck Veterinary Manual | In dogs, naproxen at 5.6 mg/kg/day for 7 days caused vomiting, tarry feces, pallor and weakness, and a single 35 mg/kg dose caused listlessness, abdominal pain, vomiting, hematemesis, diarrhea and melena. Naproxen's half-life in dogs is long, at 74 hours. | Cats may be more susceptible to naproxen than dogs because of their limited glucuronide conjugation capacity. | Dogs: signs after 5.6 mg/kg/day for 7 days, after 11.1 mg/kg/day for 3 days, and after a single 35 mg/kg dose; no cat-specific dose given |
| VCA Hospitals | Naproxen (Aleve) is named among the human over-the-counter NSAIDs that are dangerous for dogs and have a narrow safety margin, meaning that for some medications, even a fraction of a pill may cause severe signs. | Naproxen (Aleve) is named as a human NSAID in VCA's toxic hazards guide for cats, which says these medications are some of the deadliest for cats because of cats' decreased ability to metabolize them; in toxic doses they can result in kidney failure and stomach ulcers. | — |
| Eaoae summary (dogs) | ⛔ Unsafe \u2014 Known to be harmful or toxic. Keep it away from your pet. | ||
🔗 Related checks for dogs
- Eggs ✅ Safe
- Marijuana / THC (Cannabis) ⛔ Unsafe
- Blueberry ✅ Safe
- Mothballs (naphthalene) ⛔ Unsafe
- xylitol ⛔ Unsafe
- Sweet Potatoes ✅ Safe
Checked with Eaoae’s safety lookup. Answers are generated for reference and may be incomplete — always confirm with your vet for your individual pet. Spotted an error? Let us know.
