How Do I Know If My Cat Has Heartworm

Heartworm infected cats are usually asymptomatic and clinical presentation may take either an acute or a chronic course. Also, unlike canine heartworm disease, the diagnosis of feline heartworm can be challenging.


Clinical Signs of Heartworm Disease

Acute or per acute Feline Heartworm disease:

Usually caused by dead worm embolization, anaphylaxis-like reaction or migration of worms to the central nervous system. Signs include:

  • Salivation
  • Tachycardia
  • Dyspnea
  • Cough
  • Vomiting and diarrhea
  • Syncope
  • Ataxia
  • Circling
  • Head tilt
  • Blindness
  • Seizure and
  • Death


Chronic Feline Heartworm disease may include:

  • cough
  • dyspnea
  • anorexia
  • weight loss lethargy
  • exercise intolerance
  • vomiting and
  • signs of right-sided heart failure


Since it is very challenging to diagnose feline heartworm, and there is no approved heartworm treatment in cats, monthly prevention such as NexGard Combo (can be used in kittens as early as 2 months of age) is best recommended. Also, bring your cat to your veterinarian for regular check up to ensure optimal health and get your veterinarian to recommend the preventatives best suited for your cat.


The once-monthly protection against harmful parasite.