A new University of Washington study detected a parasitic tapeworm that can infect domestic dogs and humans in the intestines of one-third of coyotes surveyed in Washington. In this provided photo, a coyote (not part of the study) is pictured in a Seattle park in fall 2025.

A new University of Washington study detected a parasitic tapeworm that can infect domestic dogs and humans in the intestines of one-third of coyotes surveyed in Washington. In this provided photo, a coyote (not part of the study) is pictured in a Seattle park in fall 2025.

Courtesy Samantha Kreling/University of Washington

Advertisement

Researchers in Washington state have found that about a third of the local coyotes studied have a species of tapeworm. These can be passed to dogs, and in rare instances humans. These parasites are also present in foxes and other canid urban wildlife. Domestic dogs can also contract them, and it can be years before the symptoms of the severe disease they cause are detected, making diagnosis and treatment difficult. In rare instances, dogs can spread the tapeworms to humans. We talk with Yasmine Hentati, the study’s lead author who recently got her doctorate in environmental and forest science from the University of Washington. She shares more about these parasites and the relative risks for people and dogs.

“Think Out Loud®” broadcasts live at noon every day and rebroadcasts at 8 p.m.

If you’d like to comment on any of the topics in this show or suggest a topic of your own, please get in touch with us on Facebook, send an email to thinkoutloud@opb.org, or you can leave a voicemail for us at 503-293-1983.