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Dog Heartworm Buyer's Guide


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Heartworms kill dogs. These spaghetti-like parasites live in the heart and lungs and disrupt the flow of blood around the entire body. Heartworms are transmitted through mosquito bites, and since no form of mosquito prevention is 100% effective, all dogs should be on heartworm prevention. Thankfully, many safe and effective products are now available, but determining which one is right for your dog does take a little research. Dogs over 7 months of age should be tested for heartworm disease before starting any form of heartworm prevention. All of the following pet medications in the table below need to be given monthly to provide the best protection against heartworm disease.

Topical Heartworm Preventatives

Topical, or Spot On, heartworm preventatives use a small amount of liquid that you place directly on your dog's skin. These are similar to topical flea treatments except they are formulated to kill immature heartworms. Some of these products, like Advantage Multi or Revolution, are also effective against fleas.

Oral Heartworm Medications

Oral heartworm medications are usually available as flavored chewable tablets so they're easy to give to dogs. Many of these products also treat intestinal worms like hookworms and roundworms.

Table 1 - Heartworm Preventatives for Dogs

Sentinel Spectrum Tri-Heart Plus Iverhart Plus Interceptor Interceptor Plus Advantage Multi Revolution Heartgard Heartgard Plus Iverhart Max Sentinel Trifexis
Sentinel Spectrum Tri-Heart-Plus Iverhart Plus Interceptor Interceptor Plus Advantage Multi Revolution Heartgard Heartgard Plus Iverhart Max Sentinel Trifexis
Kills
Adult Fleas Check Check Check Check
Flea Eggs/Larvae Check
Check
Ticks Check
Heartworms Check Check Check Check Check Check Check Check Check Check Check Check
Hookworms Check Check Check Check Check Check Check Check Check Check
Roundworms Check Check Check Check Check Check Check Check Check Check
Whipworms Check Check Check Check Check Check
Tapeworms Check Check Check
Mange Check
Mites Check
Application
Topical Check Check
Oral Check Check Check Check Check Check Check Check Check Check
Ingredients
Lufenuron Check Check
Milbemycin onxime Check Check Check Check Check
Piperonyl butoxide
Ivermectin Check Check Check Check Check
Pyrantel Check Check Check Check
Praziquantel Check Check Check
Imidacloprid Check
Moxidectin Check
Selamectin Check
Spinosad Check
Age Restrictions
4 weeks or older Check Check
6 weeks or older Check Check Check Check Check
7 weeks or older Check
8 weeks or older Check Check Check Check
Manufacturer
Bayer Animal Health Check
Merial Check Check Check
Novartis Animal Health Check Check
Pfizer Animal Health Check
Virbac Animal Health Check Check
Elanco Check Check Check

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