If your dog suffers from heart failure, your veterinarian may prescribe Cardalis. When your dog suffers from heart failure, his heart is unable to pump blood adequately throughout the body. As a result, blood backs up into the lungs and fluid accumulates in the body (chest, abdomen), which further constricts both the heart and lungs, and prevents sufficient oxygen flow throughout the body. This may lead to typical symptoms like cough, reduced exercise tolerance, and reduced appetite. Cardalis is formulated with two active ingredients: benazepril hydrochloride and spironolactone. These ingredients work together to help keep blood vessels open, prevent thickening of blood vessel walls, reduce the stiffening of the heart muscle, and reduce the accumulation of fluid in the body. Cardalis Chewable Tablets for dogs are available in three different strengths: 20 mg/2.5 mg, 40 mg/5 mg, and 80 mg/10 mg. These tasty beef-flavored chewable tablets can either be mixed with a small amount of food offered to your dog just before the main meal, or with the meal itself.