Heartgard and Tri-Heart are ivermectin-based but Sentinal and Interceptor aren’t, so check the ingredients to be certain.
Oops, Sentinel.
Correct!!! One needs to use the Ivermectin based formulation....... OR if you are already treating your dog year-round for heartworm prevention, be sure you are using the Heartgard or Tri-Heart product. If so, your dog may already have protection by virtue of the Ivermectin formulation...that is IF this happens to be some sort of COVID mutation affecting our dogs!!