Rick Baker was originally hired to do the werewolf effects on The Howling, before a certain John Landis aggressively took him off the picture to work on American Werewolf in London instead. Baker passed the buck to Rob Bottin, who would utilize similar 'change o head' puppets like Baker did on AWIL.
The earliest change-o-head puppet, devised by Baker and Bottin both in the early stages of the project, was used for the transformation of TC Quist at the film's climax (first image). The other change-o-heads meanwhile, were made for the Eddie Quist transformations. Several of these change-o-head puppets were made for the different stages of Quist's morphing.
The early stages of the transformation were realized via makeup appliances designed by Greg Cannom, who bought a lot of condoms (not used ones, thankfully) to act as air bladders placed on Picardo's legs, chest, shoulder and neck, to simulate his muscles rearranging into a lupine shape - the air bladder on the neck (which was actually a hot water bottle) proved to be a hazard, as Picardo would not be able to breathe when they inflated.
