A six-year-old Coonhound mix is presented with a  two-week history of coughing, exercise intolerance and lethargy. He presents with labored breathing, tachycardia, ascites, hepatomegaly and crackles on lung auscultation. These are signs of right-heart failure. Heartworm antigen test is positive and the dog is stabilized in hospital. What is the best treatment going forward from here?

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