My dog ate ibuprofen — how bad is it?
Enter your dog's weight + how much ibuprofen they ingested. The calculator returns the mg/kg dose, the severity band, and whether to monitor at home or call a vet. Ibuprofen poisoning has a deceptive symptom-free window — call the hotline even if your dog looks fine.
Not sure what your dog ate? Start at the "my dog ate ___" triage hub →
Dose (mg/kg) = total_ibuprofen_mg / dog_weight_kg Severity: <50 mg/kg none · 50-100 GI signs · 100-175 kidney injury · 175-300 severe nephrotoxicity + GI hemorrhage · >300 critical (seizures, coma).
Enter your dog's weight, the tablet strength, and how many tablets were eaten.
Severity: — · —
Reference ranges from ASPCA APCC + Merck Vet Manual. Individual sensitivity varies — always call a hotline on confirmed ingestion regardless of dose.
How toxic is ibuprofen to dogs?
Ibuprofen is the most common over-the-counter human painkiller and one of the top-five most common pet poisoning calls to the ASPCA Animal Poison Control Center every year. Dogs encounter it in three predictable ways: chewing a dropped tablet off the floor, eating a chewable child's tablet that looked like a treat, or being given Advil by a well-meaning owner trying to relieve their dog's joint pain (this is the most common scenario behind the most severe cases).
The toxicity comes from two combined mechanisms. First, ibuprofen inhibits prostaglandin synthesis via COX-1 — this kills the mucosal protection in the stomach and small intestine, causing ulceration and hemorrhage. Second, it constricts the renal afferent arterioles — reducing blood flow to the kidneys and causing acute tubular damage at higher doses. The COX-1 inhibition is the dominant problem at low doses; the renal effect becomes severe above 100 mg/kg.
The toxicity thresholds in mg/kg
| Dose (mg/kg) | Expected effect | Treatment |
|---|---|---|
| < 50 | No significant toxicity expected. Some sensitive individuals may show mild GI signs. | Hotline call; usually monitor at home. |
| 50-100 | GI irritation: vomiting, anorexia, abdominal pain. GI ulceration possible. | Hotline call. Possible activated charcoal + GI protectants. Watch 24-48 hours. |
| 100-175 | Acute kidney injury risk + GI ulceration likely. | ER visit. IV fluids + GI protectants + bloodwork. |
| 175-300 | Severe nephrotoxicity, GI hemorrhage, CNS depression. | Hospitalization 48-72 hours. Aggressive fluid therapy, blood products if hemorrhage. |
| > 300 | Seizures, coma, hepatic failure. High mortality without intensive care. | ICU. Intensive monitoring, dialysis in some cases. |
Thresholds from ASPCA APCC reference data + Merck Veterinary Manual + Plumb's Veterinary Drug Handbook. Individual sensitivity varies — pre-existing kidney or liver disease lowers the toxic threshold significantly.
Common scenarios + math examples
- 5 kg (11 lb) dog, one 200 mg Advil: 40 mg/kg — borderline GI-irritation. Call vet.
- 10 kg (22 lb) dog, one 200 mg Advil: 20 mg/kg — below symptomatic threshold, but still worth a hotline call.
- 25 kg (55 lb) dog, two 200 mg Advil: 16 mg/kg — generally safe, monitor.
- 5 kg (11 lb) dog, three 200 mg Advil: 120 mg/kg — kidney-injury territory. ER.
- 10 kg (22 lb) dog, one 600 mg Rx tablet: 60 mg/kg — GI ulceration likely. ER.
- 5 kg (11 lb) dog, half a 200 mg Children's Advil chewable: 20 mg/kg — below threshold but the chewable tabs are flavored to be palatable; a small dog can easily eat the whole bottle.
What to do if you suspect ingestion
- Don't wait for symptoms. The early hours are when treatment is most effective. The dog often looks fine while damage is accumulating.
- Note the dose, time, and tablet strength. Bring the packaging if you have it.
- Call a hotline: ASPCA APCC (888-426-4435) or Pet Poison Helpline (855-764-7661). Both 24/7. ~$85-95 fee covers unlimited follow-up.
- Do NOT induce vomiting at home unless explicitly told to. Hydrogen peroxide-induced vomiting is contraindicated in dogs already vomiting, very young, or brachycephalic (Bulldogs, Pugs).
- Drive to the vet if directed. Activated charcoal works best within 2 hours of ingestion. Bloodwork at 24h, 48h, 72h to monitor kidney values.
Why this happens — and how to prevent it
Three patterns account for nearly all ibuprofen-poisoning cases in dogs: (1) the dropped tablet — a tablet rolls onto the floor and the dog grabs it before the human gets there. Mitigation: take your meds over the kitchen counter, not over carpet. (2) the chewable bottle — children's chewable ibuprofen is intentionally flavored to be palatable; a curious dog can chew through a soft-plastic bottle and consume the entire contents. Mitigation: keep all OTC pain meds in a closed cabinet your dog can't access. (3) the well-meaning owner — owners give Advil to their senior dog for arthritis pain. This is the most preventable and the most damaging scenario. The right move when your dog hurts: call your vet for a prescription-NSAID like carprofen or meloxicam. They're dramatically safer.
Cats are even more sensitive
Ibuprofen toxic threshold in cats is roughly half the dog value — kidney injury starts around 50 mg/kg, and lethal doses are much lower. A single 200 mg Advil can be life-threatening for a cat. Cats rarely ingest ibuprofen voluntarily, but cross-contamination from a pill dropped on the floor or a child's chewable left within reach is the usual route.
Even more dangerous for cats: acetaminophen (Tylenol). Lethal at doses as low as 10 mg/kg in cats — a single regular-strength tablet can kill a 4 kg cat. If your cat ingests any human pain medication, treat it as an immediate emergency regardless of dose.
Sources: ASPCA Animal Poison Control Center — NSAID toxicity reference data. Pet Poison Helpline — ibuprofen clinical protocol. Merck Veterinary Manual — NSAID toxicosis in dogs and cats. Plumb DC. Plumb's Veterinary Drug Handbook (10th ed., 2023), ibuprofen monograph. Khan SA, McLean MK. Toxicology of frequently encountered nonsteroidal anti-inflammatory drugs in dogs and cats. Vet Clin North Am Small Anim Pract. 2012;42(2):289-306. US-baseline sources; UK equivalents include the Veterinary Medicines Directorate (VMD) + BSAVA. Australian readers: APVMA + AVA.
Ibuprofen toxicity FAQ
How much ibuprofen is toxic to a dog?
The threshold scales with body weight. Below 50 mg/kg is generally tolerated but still warrants a hotline call. 50-100 mg/kg causes GI signs (vomiting, anorexia, possible ulceration). 100-175 mg/kg can trigger acute kidney injury. 175-300 mg/kg causes severe nephrotoxicity + GI hemorrhage + CNS depression. Above 300 mg/kg risks seizures, coma, hepatic failure, and death without aggressive treatment. For a 5 kg (11 lb) dog, a single 200 mg Advil tablet = 40 mg/kg — already in the GI-irritation zone.
My dog ate one Advil — should I panic?
Don't panic, but call a hotline. For a large dog (30+ kg / 65+ lb), a single 200 mg Advil = under 10 mg/kg — likely fine but still worth a call. For a small dog (under 10 kg / 22 lb), one Advil can reach 20-40 mg/kg — borderline GI-irritation. The Pet Poison Helpline (855-764-7661) or ASPCA APCC (888-426-4435) will tell you whether to induce vomiting at home, monitor, or go to the ER. Both are 24/7.
Why is ibuprofen so much more toxic to dogs than humans?
Two reasons. First, dogs metabolize NSAIDs much more slowly than humans — the half-life of ibuprofen in dogs is roughly 4-6 hours vs 2 hours in humans, so a single dose accumulates to higher peak concentrations. Second, dogs have less prostaglandin "reserve" protecting the gastric mucosa and renal blood flow, so the COX-1 inhibition that ibuprofen causes hits both targets hard. Most veterinary NSAIDs (carprofen, meloxicam, deracoxib) are designed to be more COX-2 selective — safer for dogs.
What about acetaminophen (Tylenol)? Is it safer?
No — and in cats, it's much more dangerous. Acetaminophen causes hemolytic anemia + hepatic necrosis in dogs at doses above 100 mg/kg. In cats, it's lethal at 10 mg/kg (a single regular-strength tablet can kill a cat). Never substitute Tylenol for ibuprofen as a "safer" choice for pets. The only safe pain meds for dogs are vet-prescribed, vet-dosed, and vet-monitored.
What are the symptoms of ibuprofen poisoning in dogs?
Onset usually within 2-6 hours. Early signs: vomiting (sometimes with blood), diarrhea, anorexia, abdominal pain, lethargy. Within 12-24 hours: increased thirst and urination (early kidney signs), pale gums, weakness. Within 24-72 hours: dark or tarry stools (GI hemorrhage), decreased urine output (acute kidney injury), neurological signs at very high doses (tremors, ataxia, seizures, coma). If any of these appear after a known ingestion — emergency vet immediately.
How is ibuprofen poisoning treated in dogs?
Treatment depends on dose and time since ingestion. Within 2 hours: induced vomiting + activated charcoal to limit absorption. Stage 2 (hours 2-72): IV fluid therapy to maintain renal perfusion + flush the drug, GI protectants (sucralfate, omeprazole, misoprostol) to reduce ulceration, antiemetics for vomiting. Bloodwork (CBC, kidney panel, liver panel) every 24 hours for 72 hours. Prognosis is excellent below 100 mg/kg with early treatment, good at 100-175 mg/kg, guarded at 175-300 mg/kg, and poor above 300 mg/kg.
My dog ate ibuprofen and seems fine. Can I just monitor?
No — call a hotline before deciding to monitor. Ibuprofen toxicity has a deceptive early-asymptomatic window — your dog may look fine for the first 4-12 hours while the drug is silently irritating the GI mucosa or already accumulating in the kidneys. The whole point of calling the hotline is to triage based on dose-per-kg, NOT on symptoms. "Wait and see" with ibuprofen has cost dogs their kidneys and their lives.
Are there safe over-the-counter pain meds for dogs?
No — there is no reliably safe OTC pain medication for dogs. The only widely-available OTC option occasionally recommended by vets is buffered aspirin at low doses (10 mg/kg every 12 hours, short-term only) — but even this carries GI and platelet risks, and modern veterinary medicine considers it inferior to prescription carprofen / meloxicam / gabapentin. The right framing: pain in dogs is a vet visit, not an OTC purchase. Most vet clinics will phone-triage and prescribe appropriately for under $100.