Apex Animal Hospital

Parasite Control

Ectoparasites (on the skin)

We are fortunate enough in Montana that the most common external parasites such as fleas, ticks, and lice are typically not a huge problem for our pets.  Nonetheless infestations do occur in Montana.  If you see any creapy crawlies on your pet please call your veterinarian so that your pet can get treatment as soon as possible.  Some infestations (especially fleas) may require treatment of the entire household and all of the household pets to get control of the situation.

Endoparasites (internal parasites)

Internal parasites such as roundworms and tapeworms don’t tend to be a huge problem for our Montana pets.  At Apex we recommend deworming outdoor hunting cats at least every 6 months and most dogs at least once annually.

If internal parasites are suspected your veterinarian will determine the type of parasite your pet has by examining a stool sample.  Depending on the type of parasites the doctor will treat accordingly.  Some of the parasites can cause significant illness or cause zoonotic disease particularly in children so don’t leave these worms untreated and always practice good hygiene.


Heartworm infections are become more common in Montana and are very prevalent in other parts of the country.   Currently Missoula and Yellowstone counties are reporting the most positive dogs.  It is important to keep pets protected from these parasites through preventatives.  Pets that travel outside of Montana may be at considerable increased risk of getting parasites including heartworms if not on appropriate preventative.  At Apex we recommend treating all dogs with a preventative such as ivermectin or selemectin during the mosquito months from May through October.  Annual testing regardless of the use of preventatives is a must.  For more information, click here to visit the American Heartworm Society.