Intestinal parasites are worms that can live in your pet’s body and grow to adulthood in its intestinal tract. Parasite control (or deworming) is an important way to safeguard not only your pet’s health, but also that of you and your children. Parasites can affect your pet’s ability to absorb nutrients, damage the lining of its intestinal tract, and cause your pet to become very ill.

Children are more prone to contract roundworm than adults as they are more likely to touch infected dirt or sand and then put their hands into their mouths.Children are more prone to contract roundworm than adults. It’s best to not let children play in areas that may be soiled with pet waste and to make sure they practice good hygiene.

In rare cases, roundworm infection can cause permanent partial blindness.

Symptoms of Infection by Intestinal Parasites

Symptoms of infection may include: change in appetite, coughing, diarrhea, weight loss, and a rough or dry coat. However, some pets show no symptoms, so regular health exams with a fecal check are important.

Common Parasites

roundworm - a common intestinal parasiteRoundworms

Adult roundworms are an intestinal parasite that resemble strands of spaghetti. Their eggs are shed through a pet’s feces and, while fresh feces are not infectious, the eggs become infectious over time as they sit in grass, soil or sand. This is why picking up pet waste promptly is important. Roundworms can cause vomiting or diarrhea.

Children are more prone to contract roundworm as they are more likely to touch infected dirt or sand and then put their hands into their mouths. Do not let children eat sand or dirt. Children should wash hands thoroughly after playing in areas where pet waste may have been deposited. Keep sandboxes covered when not in use. In rare cases, roundworm infection can cause an eye disease that can lead to blindness; such infections can be more serious in children than adults. Gardeners should wear gloves and wash hands after working outside.

tapeworm -  this intestinal parasite can be transmitted by eating fleas that harbor tapeworm larva


Your pet can contract tapeworms from eating fleas that can harbor the tapeworm in its larval stage or from eating an infected rodent. Segments of the tapeworm resembling bits of rice are often shed in the feces or found clinging to the hair near the rectum.


Hookworm - one sign of this intestinal parasite is blood in the pet's stool

Hookworms & Whipworms

Hookworms attach themselves to your pet’s intestinal lining, and can cause dark feces or bloody diarrhea. Whipworms, found in the large intestine, can cause diarrhea also. If you notice blood in your pet’s stool, collect a sample and bring it in to us to check.


Heartworms - this parasite is carried by mosquitos.


Although less common than other worms, heartworm disease is a serious, life-threatening infection of the heart caused by the adult stage of the parasite Dirofilaria immitis. Heartworm is present in Oregon, even in the metropolitan areas. Mosquitoes are the carriers of heartworm disease. As a part of a regular health exam, your veterinarian may recommend testing and preventative medication for heartworm. Many heartworm preventatives also protect your pet against other types of worms.



Testing & Treatment

Kittens and puppies are commonly infected with parasites and should be tested as part of their early life care, which includes examinations and vaccinations. Typically, your veterinarian will ask you to provide a stool sample for testing. Sometimes, more than one test will be required to ensure that the parasites have been eliminated.

For kittens and puppies, or any pet you suspect may be infected, collect a fresh fecal sample within 12 hours prior to an examination. Keep the sample cool or refrigerated. Your veterinarian will examine the sample to identify the parasite. Different parasites will require different treatments, so proper identification is key.


An annual fecal check is recommended and can be done as part of your pet’s annual health exam. Preventative medication is available; talk with us about whether this medication is appropriate for your pet. To prevent (re)infection, it’s best to keep your pet away from other pets’ waste and dispose of your pet’s own waste quickly.

Wash your hands after playing with your pet. As with any health concern involving your pet, be sure to consult with us if you think your pet may be infected with parasites.