Before Rocky made him rich and famous, Sylvester Stallone had to sell his beloved dog, Butkus, for $40 in order to afford food. However, after selling his iconic screenplay, he bought his best friend back for $15,000. He then cast Butkus as Rocky's dog in the movie.
source https://www.buzzfeed.com/kristenharris1/celebs-pets-in-movies-tv
