Aleve (naproxen)
Signs of toxicity include:
Naproxen ingestion causes bleeding ulcers in the stomach and small intestine. The end result of naproxen toxicity is kidney damage or failure and/or liver damage. If your dog has ingested naproxen, INDUCE VOMITING and seek veterinary assistance for follow-up care. If your cat has ingested naproxen, seek veterinary assistance immediately. Naproxen toxicity can be fatal if left untreated.

