Furosemide is a diuretic medication used in both dogs and cats to treat congestive heart failure, pulmonary edema, and other conditions that cause fluid buildup in the body. It works by increasing urine output and reducing fluid retention. Furosemide can be given orally or intravenously, and the dosage may need to be adjusted based on the animal’s response and any potential side effects such as dehydration or electrolyte imbalances.