Furosemide Compounded Oral Liquid for Dogs and CatsDescription Description Furosemide Oral Liquid is an ExpressVet exclusive medication that prevents fluid buildup in the lungs and abdomen of dogs, or cats, with congestive heart failure and some types of kidney diseases. Furosemide is a loop diuretic, promotes diuresis, the process of extra urination, and helps manage fluid retention so your pets body can get rid of excess liquids and substances. It can also be helpful in treating high blood pressure.