"He is more than a stuffed animal to William, he is comfort for every scary crappy thing he has fought since he was 18 months old," she wrote.
Kari Ihle believes the toy was lost at at one of the airports they used last week in Minneapolis, Dallas and Phoenix. The airlines the family used were Delta and American Airlines, KARE reported.
Readers on Facebook were eager to help, and some offered to send substitute Eeyores to the boy. Kari Ihle is using the hashtag #operationletsfindeeyore to find the toy.