Heartworm Prevention

Heartworm Prevention


Heartworm disease is a serious and potentially fatal condition caused by parasitic worms living in the arteries of the lungs and hearts of dogs, cats and other species of mammals, including wolves, foxes, and ferrets. Heartworm disease develops when our pets are bitten by mosquitoes carrying microscopic heartworm larvae. As the mosquito feeds, these larvae are deposited on the skin to begin their migration into the pet’s bloodstream.

Canine Heartworm Disease

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 Adult heartworms in dogs can grow 10 to 12 inches in length and make their home in the right side of the heart and pulmonary arteries, often causing lung disease and heart failure. Although easy to prevent, heartworm disease continues to be a major health problem for dogs living in throughout the world, especially in temperate climates.

Feline Heartworm Disease Baby Siamese Kitten

Most cat owners don’t worry about heartworm disease and fewer still use any sort of heartworm preventative. But, as veterinary scientists continue to discover, feline heartworm disease has become a severe threat to our cat companions. Yet, according to the American Heartworm Society, only about 5% of cat owners use any sort of heartworm preventative. Like dogs, cats acquire the parasite from mosquitoes but this is where any similarity ends!

Upon infecting a cat, the heartworm larva will travel to the blood vessels of the heart and lungs, where it will grow to be about two inches long. At this time, cats may exhibit respiratory symptoms that are often misdiagnosed as bronchitis or asthma.

As the heartworms mature, signs of their presence will often diminish. In fact, evidence suggests that cats can appear to tolerate the infection. However, when the mature worms start dying, massive inflammation occurs, which can lead to acute lung injury and even sudden death.


  • Protects against heartworms
  • Kills fleas & ticks
  • Protects against hookworms & roundworms
  • Protects against ear mites & sarcoptic mange
  • Is applied topically once montlhy
  • Is absorbed through the bloodstream
  • Is not altered by bathing or swimming


  • Protects against heartworms
  • Prevents flea eggs & larva from maturing
  • Protects against hookworms, roundworms & whipworms
  • Oral tablet which must be given with food for adequate absorption, once monthly

Heartgard Plus:

  • Protects against heartworms
  • Oral chew treats given once monthly
  • Protects against hookworms & roundworms