Why it's dangerous
Tinsel acts as a linear foreign body that can anchor in the stomach or under the tongue, causing the intestines to bunch up and the string to saw through the intestinal tissue.
Good to know
Particularly dangerous for cats due to their curious nature; includes other stringy items like yarn, ribbon, and cassette tape.
Sources
This page is informational and is not veterinary advice. If your pet has been exposed to something risky, contact your vet or an animal poison control line right away.