Heartworm Disease: Signs, Treatment, Prevention Protect your dog
or cat from heartworm disease, which is caused by being bitten
by infected mosquitoes. Heartworm testing and regular preventive
medications will protect your pet and prevent an infection with
adverse effects. Do you know all there is to know about
heartworm? We've compiled a list of the most important heartworm
facts. Heartworm in Ferrets Although heartworm is often thought
of as only affecting dogs and cats, a ferret may also be
infected by this dangerous parasite. An important part of a
complete heartworm prevention program is testing. Testing
ensures that your pet is free of adult heartworms, and ready to
start or continue on heartworm preventive medication.