FHSS systems at all, because instead of using pure frequency-hopping, they also use DSSS spreading techniques to ensure that they also create distributed a spread spectrum (DSSS) output. However, for the purposes of this article and to avoid confusion, I'll use the term FHSS for these systems.
Dogs that are already on heartworm preventive medication should also be tested periodically. The âprepatent periodâ for heartworm disease (the amount of time it takes for microfilariae to be produced) is approximately 6 months in a dog. During this time, heartworm tests will be negative even if a dog is actually infected. Therefore, puppies younger than 7 months old are generally not tested for heartworms. Instead, puppies should be started on heartworm preventive medication (usually during their puppy checkup visits) and tested when they are older than 7 months.
Mosquitoes generally carry heartworm larvae and transmit them to pets through bites. Although most pets are required to undergo a heartworm blood test before theyâre given any preventive medications, pets that are 6 to 8 weeks of age donât have to do this test in order to take the medication.