I am not sure which ones are best for me, but i am happy with what i’ve gone with. In 2000, the new england compost association conducted a survey on the use of ivermectin in animal and companion animal medicine, which found that about 60 percent of the responding respondents are currently seeing, treating, or using ivermectin, of which about 40 percent are using it to prevent heartworm disease in their dogs. Based on the results of clinical trials, ivermectin has been found to be a highly efficacious anthelmintic against a.