The models of each character were hand-made and created by puppet maker Andy Gent from Arch Model Studio, who said that the process of covering Ralph in fur took five weeks. On producing the short film, Jeff Vespa said he wanted to create a project where people would want to watch and learn about the dangers of animal testing, deciding an animated film would be the best approach. In casting an actor to portray Ralph, Spencer said the first person he contacted was Waititi, who quickly agreed to star.