Due to this life - cycle, In order for a cat to be infected with heartworm disease, the cat must be bitten
by an infected mosquito since heartworms are not directly transmitted from one cat to another or from a cat directly to a dog.
Heartworm disease in dogs is included in both the external and the internal sections about parasites,
since the heartworms themselves are internal, but are caused
by the bite of an
infected mosquito.