Official Government Website

Dennis the Cat Day

Enjoy a Summer Sunday afternoon and celebrate Dennis the Cat, the Old Idaho Penitentiary’s historic animal mascot. Join us for Prison Pets history presentations, a Prison Paws scavenger hunt, food trucks, and more!
Be sure to bring donations of unopened pet food for admission to the Prison Pets history presentations. Donations benefit the Idaho Humane Society and Simply Cats, Boise’s cageless, no-kill, feline adoption center. Presentations take place at 12:30, 1:30, 2:30, 3:30 and 4:30pm.
Between 1952 and 1968, Dennis lived among the staff and residents of the Idaho State Penitentiary, becoming one of the site’s best liked and most respected figures. Upon Dennis’ death in 1968, the prison population buried him nearby within the main yard, fashioning a durable engraved headstone marking his resting place during his funeral services. Today, guests of the Old Idaho Penitentiary regularly pay their respects at his stone, the only marked grave within the prison walls.


May 30 2021


12:00 pm - 5:00 pm


Old Idaho Penitentiary
2445 Old Penitentiary Rd., Boise, ID, 83712

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