The hidden danger of 5-FU (Fluorouracil) cream in Dogs & cats
5-FU (fluorouracil) is a common human medication found in topical creams, but it poses a severe and often fatal risk to both dogs and cats. Even small exposures—such as licking treated skin or a medication tube—can lead to rapid toxicity. Dogs tend to develop sudden, life-threatening neurologic symptoms, while cats may show more subtle early signs that can delay recognition. Immediate veterinary care is critical. Understanding where 5-FU is found and how exposure occurs is essential to keeping pets safe and preventing a medical emergency.