I'll add a snippet from the vfx company onto that that further describes it as a present tense transformation.
"Another challenge was the dinner sequence," Michael continued, "which involved extensive head extensions and replacements to convey the drug visions of the main character, who sees her family turn into a bunch of animals. Technically, we needed to seamlessly match fur to live action prosthetics, and creatively we had to find the balance between realistic integration and visualization of the drug visions."
http://www.primefocusworld.com/yellow/