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Dangerous
Naproxen is very toxic to dogs.
More dangerous than ibuprofen for dogs due to longer duration of action. Causes severe stomach ulcers and kidney failure. Even a single pill can be life-threatening.
Dangerous
Naproxen is very toxic to cats.
NSAIDs like naproxen are extremely dangerous for cats, causing kidney failure and GI ulceration. Even a small amount can be fatal. Seek emergency vet care.
If your dog has eaten this food and shows signs of distress (vomiting, diarrhea, lethargy, tremors, or seizures), contact your veterinarian immediately.