However, they are often cordial and friendly towards one another and it is said by Doofenshmirtz that Perry is his best friend, and Perry will often act to save Doofenshmirtz's life when his plot inevitably blows up in his face.
Namun, mereka sering bersikap ramah dan ramah terhadap satu sama lain dan dikatakan oleh Doofenshmirtz bahwa Perry adalah sahabatnya, dan Perry sering bertindak untuk menyelamatkan kehidupan Doofenshmirtz saat komplotannya pasti meledak di wajahnya.