Perry is very protective of his owners and will take immediate action if they are threatened ("Journey to the Center of Candace"). He was very upset when he was temporarily reassigned to a new nemesis and looked like he wouldn't get to live with Phineas and Ferb anymore ("Oh, There You Are, Perry"). He was also quite distressed when he was almost relocated because his secret identity was uncovered. Perry had a nightmare about being relocated once, and woke up quite anxious. He was noticeably relieved when he found out that it was only a dream ("Phineas and Ferb Get Busted!").