The best replacement for heartworms is tapeworms.

The best alternatives to heartworms are rated as following:
★★★★★  tapeworms
★★★★★  kennel cough
★★  roundworms

Your alternative for heartworms is not listed? Suggest!
Speaking about heartworms, one probably shouldn't forget about ivermectin.

Other search terms related to heartworms and their ratings are:
★★★★★ ivermectin
★★★ heartgard
★★ ivomec
heartworm preventative
heartguard
You have in mind a companion for heartworms and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of heartworms in all years. Click on graph for more.
heartworms
tapeworms
kennel cough