Managing Symptoms of Heart Murmur in Dogs with Lasix

Lasix is a medication used to treat dogs suffering from heart conditions such as heart murmur. A heart murmur is often diagnosed during routine vet checks, as many pets appear healthy despite symptoms of heart murmurs. The cause of heart murmurs varies and often occurs in younger pets and pets genetically predisposed to heart conditions. Pet owners should notice any symptoms of heart problems that accompany heart murmurs and keep the vet informed.

Symptoms to Watch for Include:

  • Rapid heartbeat
  • Irregular heartbeat
  • Difficulty breathing
  • Lethargy
  • Anemia

Diagnosis of Heart Murmur in Dogs

If the heart murmur is exhibited by puppies or young pets the vet will conduct repeat exams to determine if the murmur is persistent. After listening to the pet’s heartbeat with a stethoscope for murmurs or abnormal heartbeats, the vet will perform an electrocardiogram (ECG). This measures the heartbeat to determine abnormal blood flow through the heart and heart problems that warrant further tests. Other tests include echocardiograms that provide a detailed examination of the heart, its chambers, size and shape. Since heart murmurs occur due to abnormal blood flow through the heart, an echocardiogram is an effective test to help confirm diagnosis. However, since echocardiograms don’t reveal fluid accumulation in the chest cavity or lung disorders, x-rays are essential.

Treatment of Heart Murmur

Since pets suffering from heart murmur exhibit irregular heartbeat, it's best to initiate treatment at an early stage to prevent congestive heart failure. Although the type of medication used varies according to the severity of heart disease present, pets may be prescribed Lasix to control and prevent future heart complications.

Lasix for Dogs

Lasix is the brand name for the drug furosemide, formulated for the treatment of heart illnesses and other health concerns in pets. Furosemide works to dilate blood vessels in the heart to facilitate smooth blood flow. In addition, it benefits pets suffering from fluid accumulation in the chest cavity and thus reduces cough associated with heart conditions. Since it reduces high blood pressure, it works in several ways to control heart problems in dogs.

Dosage and Administration

The drug furosemide is a prescription medication and should hence be used according to vet instructions. As a general guideline, the medication may be administered twice daily as a dose of 1 to 2 mg per pound of body weight. Since furosemide is a diuretic that increases urination, pets should have easy access to water throughout the day. Pet owners should read medication labels before administering any dose to dogs, because it’s necessary to understand the side effects and possible drug interactions.


  • Drugs such as Lasix shouldn’t be administered to dogs with known hypersensitivity to its ingredients.
  • Pets may suffer from reported side effects such as nausea, electrolyte imbalance, rash and weakness.
  • Pet blood should be tested frequently for liver and kidney function and electrolyte levels.
  • There are several drug interactions when Lasix is administered along with other medicines ,such as prednisone and antibiotic drugs.
  • The medication may not be safe for use in dogs suffering from pre-existing kidney disorders or liver disease.

Although Lasix works effectively in some pets, it’s best to work with the vet to determine treatment options suited to individual dog needs. Apart from medication, dogs suffering from heart problems may benefit from dietary modification and exercise.