More: In May 2021, Sullivan was diagnosed with severe kidney failure. After a 5 day stay at the Madison Veterinary Specialists Clinic, where he received around the clock treatment, Sullivan was given weeks to months left to live. A cause of his kidney failure was never identified. Upon returning home, Sullivan refused to eat anything other than processed human food until one day he showed interest in Purina Pro Plan NF Kidney Formula Food. Six months later, Sullivan has beaten the odds and his kidney values have improved more than anyone thought possible. Sullivan is on a kidney food diet of Purina Pro Plan NF Kidney Function Formula and is as happy and energetic as ever!