Heartworm Positive Dog Reportedly 'Vibing' Despite Housing 47 Adult Dirofilaria immitis

A 7-year-old golden retriever named Captain has baffled veterinary parasitologists by maintaining an exuberant, tail-wagging demeanor despite harboring what radiographic imaging confirmed to be 47 adult Dirofilaria immitis specimens in his pulmonary arteries and right heart chambers. 'By every diagnostic criterion, this dog should be in Class 3 heartworm disease,' said veterinary cardiologist Dr. Lucia Microfilaria. 'Exercise intolerance, coughing, caval syndrome — the textbook is very clear. Instead, he fetched a ball for forty minutes this morning and then tried to eat a bee.' Captain's owner, Greg Plinth, brought the dog in for a routine wellness check, during which a standard antigen test returned what the laboratory technician described as 'the most positive positive I have ever seen.' Subsequent echocardiography revealed adult worms visibly undulating in the right ventricle, a finding Dr. Microfilaria called 'genuinely unsettling to watch while the dog licks your face.' 'The worms are just in there,' she said. 'Forty-seven of them. Living their best lives. And Captain is also living his best life. Nobody in this scenario is struggling except me, the veterinarian who has to explain this to her residents.' The Wolbachia endosymbiont bacteria housed within the nematodes were similarly thriving, making Captain what one researcher called 'a nested Russian doll of organisms that are all doing great.' Treatment with melarsomine dihydrochloride has been initiated per American Heartworm Society guidelines. Captain reportedly ate the pill wrapped in cheese without hesitation and immediately resumed attempting to eat a different bee. Plinth has been counseled on year-round macrocyclic lactone prophylaxis. 'I thought the monthly chewable was optional,' he said. It is not.