Did you know that parasites are threats to your dog all year long? Despite the common belief that ticks, fleas, and mosquitoes are only active in warmer months, these pests can cause big problems for your dog at any time during the year.

They are not only a nuisance, but they can transmit diseases to your dog. The best way to protect your dog against them is year-round tick, flea, and heartworm disease protection.

Common Parasites Your Dog Encounters


Fleas are a common parasite that bite, transmit disease, and cause your dog to itch, making them very miserable. Fleas also suck blood, and when left unchecked, this can cause lethargy, weakness, and even death if not caught and treated in time. Common (medical) conditions and infections from fleas include flea allergic dermatitis and tapeworms.

To make sure a flea infestation doesn’t begin or become a vicious cycle in your home, all your pets, including indoor-only cats or dogs, need to be on a year-round preventative. Once fleas enter your home, they can quickly take hold (each adult female flea can lay anywhere from 20–50 eggs each day)[1] and cause an infestation that can be very difficult to completely get rid of.


Ticks can be found anywhere in the United States - and at any time of the year. Like fleas, ticks suck a dog’s blood, and when left unchecked can also cause related health problems. Ticks can also transmit several debilitating diseases in dogs, such as Lyme disease, anaplasmosis, tick paralysis, and Rocky Mountain spotted fever[2,3,4].

Even when using tick preventative medications, it’s still a good idea to check your dog for ticks after time spent outside, so your dog doesn’t bring ticks indoors (and also as an additional layer of protection against disease transmission).

Caring for Your Heartworm-Positive Dog
Fleas, Ticks, & Heartworms
Caring for Your Heartworm-Positive Dog
What Are the Symptoms of Heartworm Disease in Dogs?
Fleas, Ticks, & Heartworms
What Are the Symptoms of Heartworm Disease in Dogs?


Mosquitoes can transmit many diseases, and just a single bite from an infected mosquito can put your dog at risk for developing heartworm disease. While dogs that spend lots of time outside (when mosquitoes are feeding) may have a higher risk, even dogs that rarely go outside are at risk for heartworm disease. In fact, cases of heartworm disease have been diagnosed in all 50 states[5].

While there are treatments available for dogs with heartworm disease, they aren’t without potential medical complications, high costs, and logistical problems (like strict crate rest for several months). Even after treatment for heartworm disease, your dog can be left with irreversible damage to the heart and lungs. Prevention is key to keep your dog from developing heartworm disease.

Prevention: Your Dog’s Best Form of Defense

These common parasites your dog encounters are easily prevented with products available from your veterinarian. There are chewable pills, topical solutions, and even injections that can be used to help protect your dogs. Your veterinarian should be your go-to advisor to help you figure out the products and plans that are best suited for your pets.

Prevention is a healthier, less expensive way to keep your dog healthy and safe from the many parasites they are likely to come into contact with. Keeping your pet on a full-year preventative plan will help give you peace of mind that they’re protected from parasites all year long.


Claire Walther, DVM

Dr. Claire Walther was born and raised in Dayton, Ohio. She received her BS and DVM from Purdue University in West Lafayette, Indiana. While at Purdue University, she graduated with honors for her research. During her veterinary education, she acted as a clinical pathology technician and developed a keen understanding of clinical laboratory testing. She practiced outside Indianapolis in corporate (Banfield) and independent general practice before joining Zoetis in 2016. Dr. Walther is currently the Zoetis Petcare HQ Feline Pain Strategy Director.

The Walther family includes 3 dogs (Eelie, Eva, and Vanilla Bean) and two cats (Gambit and Linkin). It is the love she shares for her family, both human and animal, that fosters her drive to enhance our ability to detect, prevent and treat disease within the field of veterinary medicine.

  1. Flea Control and Prevention. Potter, Michael F. University of Kentucky Department of Agriculture. https://entomology.ca.uky.edu/ef602. Accessed March 25, 2019.
  2. Blagburn BL, Dryden MW. Biology, treatment, and control of flea and tick infestations. Vet Clin Small Anim. 2009;39(6):1173-1200.
  3. Centers for Disease Control and Prevention. Geographic distribution of ticks that bite humans. http://www.cdc.gov/ticks/geographic_distribution.html. Updated June 1, 2015. Accessed February 19, 2019.
  4. Life cycle of hard ticks that spread disease. Centers for Disease Control and Prevention website. http://www.cdc.gov/ticks/life_cycle_and_hosts.html. April 20, 2017. Accessed: February 19, 2019.
  5. Current canine guidelines for the prevention, diagnosis, and management of heartworm (Dirofilaria immitis) infection in dogs. American Heartworm Society. https://www.heartwormsociety.org/images/pdf/2014-AHS-Canine-Guidelines.pdf. Accessed March 30, 2017.