Martin Short's daughter, Katherine Hartley Short, reportedly had a service dog to help her navigate"mental illness" prior to her untimely death at age 42. Katherine reportedly shared a photo and bio for her dog Joni, named after singer Joni Mitchell, on her since-deleted professional website, according to Page Six. "Joni is my incredible service dog, who has been assisting me with my own struggles with mental illness for the past 5 years," Katherine reportedly wrote on the site, per the outlet. "Joni will often be in the office with me, cuddled up on her bed.