Testing for heartworm disease in dogs is very straightforward, but in cats that isn't the case. (catclinicofjc.com)
While treatment for heartworm disease in dogs is possible, it is a complicated and expensive process, taking weeks for infected animals to recover. (baldwinanimalhospital.com)
If you do not do this it is possible the manufacturer of the products may not cover your pet's treatment should they test positive for heartworm disease in the future. (norwalkanimalhospital.com)