Heartworms primarily affect dogs, but they can also infect other animals, particularly cats and ferrets. In cats, heartworms can cause a condition known as heartworm-associated respiratory disease (HARD), which can lead to severe respiratory issues. However, the life cycle of heartworms is different in cats, and they are not as suitable hosts as dogs. In ferrets, heartworms can also be a concern, although cases are less common. It's important for pet owners to keep all pets protected from heartworm infection by using preventive medications and regular veterinary check-ups.

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Topics covered in this question:

Dog Care Heartworms Pet Health Cats Ferrets