- The most frequent reasons are that doses of heartworm preventive were not given.
- Insufficient amount of product was purchased for each pet in the household.1
- A monthly dose of preventive was available but not given.
- The dog may have been infected with heartworms, including immature adult worms, when started on preventive.
- The heartworm preventive may have failed to eliminate all migrating tissue larvae at the time of administration.
1Atkins CE, et al. Heartworm ‘lack of effectiveness’ claims in the Mississippi delta: Computerized analysis of owner compliance - 2004-2011. Veterinary Parasitology 2014;206;106-113
Questions Part 2:
HEARTWORM PREVENTIVE MAY TEST POSITIVE?