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Dennis the Cat Day

Join the Old Idaho Penitentiary on a Summer Sunday afternoon and discover the story of the Penitentiary’s historic animal mascot, Dennis the Cat during our second annual Dennis the Cat Day!

Activities include Prison Pets history presentations, Prison Paws scavenger hunt and more! Food trucks, beer and alcohol, local pet supply vendors, special presentations, new Dennis merchandise, and more will be available!

Dennis the Cat Day: Sunday, May 28, 12:00 pm – 5:00 pm (last admission 4:00 pm). All ages welcome.

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.

Presentations take place at 12:30, 1:30, 2:30, 3:30 and 4:30pm.

Check out the winning poster artwork by Andrea for this year’s Dennis the Cat Day poster art contest!

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.