These images were obtained from an 8-year-old, intact male Boxer presented for progressive abdominal distention of 2-weeks duration. At initial physical examination, the dog was slight and thin with obvious abdominal distention secondary to fluid accumulation. A loud (IV/VI) systolic murmur was heard over the tricuspid valve area. The jugular veins were distended, and the femoral pulses were weak. Routine blood work was unremarkable with the exception of mild azotemia (BUN = 40), anemia (HCT = 28), and thrombocytopenia (platelets = 125,000). A heartworm antigen test was positive, and many
circulating microfilaria were present.