Tips for starting a healthy backyard flock this spring, and a look at preventing Heartworm

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board of animal health

Animal Bytes

March 2026

Heartworm prevention: stay ahead of the mosquitoes

Heartworm infection

Heartworm, as the name implies, is a parasitic worm that lives within the hearts of many canine species like dogs. It is a serious disease caused by a parasite spread through mosquito bites. Adult mosquitoes become carriers once they feed on the blood of infected dogs and pick up the larval stages (baby heartworms). They then spread the infection on to the next dog when they take their next blood meal, injecting the larval stages into the next animal. Once inside the next animal, the larval stages work their way to the heart, where they develop into adult worms and the cycle repeats. If not found and treated early on, these adult worms can cause lasting heart damage.

Prevention of heartworm is the best medicine and there are many products on the market. From oral tablets or topical products given or applied monthly, to a long-acting injection lasting either 6 or 12 months. Some of these products may also be combined with a flea and tick preventative. These medicines work by stopping the parasite before it can mature. Year‑round prevention is recommended because mosquitoes can survive well into shoulder seasons, and heartworm preventatives work backwards. They kill the young, larval stages of the worm within the newly infected animal before they have the chance to mature into adults. In other words, if a dog is given a monthly heartworm preventative in December, it is actually killing any of the larval stages that infected the dog in November. In addition to medications, eliminate mosquitoes in and around the environment where dogs spend a majority of their time. Remove mosquito habitat like old tires or other objects that collect water.

How do you know if your dog has it?

Early in the disease process, most dogs do not exhibit clinical signs. As the disease progresses, signs may include coughing, tiredness, trouble breathing, and ultimately death caused by heart failure. A simple annual blood test at your veterinarian is the only reliable way to detect infection early.

Are cats affected?

Cats can get heartworm too, although usually with fewer worms. Rather than heart failure, cats tend to develop severe allergic bronchitis. Even a single worm can cause significant, life-threatening lung inflammation. There is no approved treatment for adult heartworms in cats, making prevention especially important.

What about people, is there a risk to pet owners?

Heartworm cannot spread directly from pets to people. In rare cases, humans can be infected with heartworm by mosquitoes, but these infections do not develop into heart disease and are generally not dangerous.

Is there risk all over the state?

Heartworm has been diagnosed in pets throughout Minnesota. Mosquitoes thrive in many of our environments and changing weather patterns have extended their active season. Although most mosquitoes do die off in the winter, infected wildlife such as foxes, coyotes, and wolves act as a reservoir, keeping the adults alive and producing larval stages for the next season and the next batch of mosquitoes to arrive and continue the cycle.

Is it treatable?

Dogs can be treated with a veterinarian managed protocol that includes medication and strict rest. Treatment is effective but lengthy and costly. There is a risk of pulmonary embolism as the dying adult heartworms break apart in the heart and float freely into the bloodstream. If this occurs it can cause life threatening problems, which reiterates the old saying, prevention is the best medicine.

Keep reading...

Biosecurity for new flock owners

Biosecurity is everyone's responsibility and revolves around the idea of preventing the introduction and spread of disease by implementing procedures that reduce the risk of disease transmission. Done effectively, biosecurity and good animal husbandry habits can keep birds healthier.

Spring is a popular time of year to buy baby poultry and get started on this season’s backyard flock. With that in mind, we developed resources for first timers just getting started with poultry. Understanding biosecurity before owning poultry helps create a healthy environment for your birds and prevents potential disease risks to them and neighboring flocks.

Some examples of the simple steps to take include quarantine new birds, maintain cleanliness in the coop, limit visitor access to the poultry area, and educate yourself about biosecurity practices.

Need more details or a plan to follow? Review our biosecurity checklist for new poultry owners.


Prepping your pets for spring to fight fleas and ticks

To begin with, let's explore where fleas and ticks are found. Dogs and cats can become infested with fleas when exposed to environments where fleas thrive, such as shaded yards, debris piles, dense vegetation, or indoor areas like carpets and furniture. Fleas are very resilient, surviving in warm and humid conditions, and can remain active throughout the year if a host is present.

Ticks inhabit some similar locations like tall grass, wooded areas, shrubs, and leaf litter. They latch onto pets, or people, by "questing," which is waiting to grab a passing host. Despite some myths, ticks cannot jump.

Once these pests attach to a host, like your pet, they can cause harm.

Flea-borne concerns:

  • Tapeworm infection. Fleas can carry tapeworm larvae that infect pets when swallowed during grooming.
  • Flea allergy dermatitis. Allergic reactions cause itching, hair loss, and skin irritation potentially leading to secondary infections.
  • Anemia. Severe infestations may result in blood loss, especially in young animals.
  • Disease. Bacterial infections such as Bartonella and Mycoplasma and to a lesser extent Tularemia.

Tick-Borne Concerns:

  • Tick bites can transmit multiple infectious agents resulting in chronic or life-threatening diseases. These include Lyme disease, anaplasmosis, babesiosis, and ehrlichiosis, Tularemia, and Rocky Mountain spotted fever.
  • Early detection and removal are critical since pathogens can take from 12 to 36 hours to transmit after attachment.

Now that you know the risks, let's explore ways you can stop the threat.

Outside:

  • Limit pets’ exposure to wildlife and stray animals.
  • Maintain clean yards by mowing lawns, clearing debris, and avoiding overwatering to reduce humid habitats favorable to fleas and ticks.
  • Treat outdoor pet areas with EPA-approved insecticides when necessary.

On your pet:

  • Preventative products are available in various forms including oral tablets, topical applications, and collars. Different options may have pros and cons for your pet so be sure to ask your vet what they recommend.
    • Please note: Most products are well-tolerated but you should monitor pets for skin irritation, gastrointestinal upset, or rare neurological effects (e.g., isoxazoline-related seizures in predisposed dogs from products such as Nexgard or Bravecto). Also, ensure products intended for dogs are not used on cats and vice versa due to toxicity differences! Lastly, consult a veterinarian when treating pregnant, nursing, or young pets to ensure product safety.
  • Year-round prevention is advised, as fleas can survive indoors and ticks can be active at temperatures as low as 40°F.
  • Inspect pets regularly and/or use a fine-toothed flea comb and carefully check ears, armpits, groin, and tail bases.

Although dogs and cats are susceptible to, and can potentially be infected by, many of the same disease spread by fleas and ticks, there are some significant differences between the two in how they react to those infections.

Dogs are more likely to be affected by the tick-borne diseases such as Lyme, Ehrlichiosis, Anaplasmosis. Cats can get Lyme disease, but clinical signs are mild and often self-limiting, meaning cats tend to get over the infection on their own. Often the signs are so mild they go unnoticed.

Both dogs and cats can be infected with Tularemia, but cats are very susceptible to the bacteria. Early detection and treatment are critical to ensure recovery. Dogs can get Tularemia, but it appears to occur less often, and clinical signs tend to be less severe than what we see in cats.

Don't forget, humans can also get many of these diseases, but they don’t spread directly from cats or dogs to people. Tularemia would be an example of an exception to the rule. Being bit, scratched, exposed to saliva via petting the fur, or even inhaling aerosolized dust particles contaminated with the bacteria are all possible ways people can be exposed to Tularemia by an infected pet in the household.

April Board meeting details

The next quarterly meeting of the Board of Animal Health is Wednesday, April 1, 2026 at the University of Minnesota's St. Paul Campus. Please check our website for the latest agenda and meeting details.