Signs of heartworm disease in dogs

Learn which signs to look out for so you can recognize if your dog has heartworm disease and seek effective treatment sooner rather than later.

The risks of heartworm disease in dogs

Heartworms can live in an infected dog for 5-7 years, so they can produce severe damage in your dog’s heart and lungs over time.2 This damage can include:

  • Clogging and damage to the lining of the arteries leading from the heart to the lungs
  • Heart valve malfunction
  • Liver and kidney dysfunction
  • Heart failure

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Heartworm lifecycle

Learn how your dog gets infected with heartworms and how they develop in the body.

Heartworm disease prevention

In a controlled laboratory study, Interceptor Plus was 100% effective against induced heartworm infections when administered once monthly for 6 consecutive months.

Why Switch to Interceptor® Plus?

Find out how monthly Interceptor Plus provides effective, year-round heartworm disease protection.


Interceptor Plus prevents heartworm disease and treats and controls adult roundworm, hookworm, whipworm, and tapeworm infections in dogs and puppies 6 weeks or older and 2 pounds or greater.

Important Safety Information

Treatment with fewer than 6 monthly doses after the last exposure to mosquitoes may not provide complete heartworm prevention. Prior to administration of Interceptor Plus, dogs should be tested for existing heartworm infections. The safety of Interceptor Plus has not been evaluated in dogs used for breeding or in lactating females. The following adverse reactions have been reported in dogs after administration of milbemycin oxime or praziquantel: vomiting, diarrhea, decreased activity, incoordination, weight loss, convulsions, weakness, and salivation. For complete safety information, please see Interceptor Plus product label or ask your veterinarian.

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