Animators have often had props and sculptures of all sorts through the years to help them imagine the different views and possibilities if characters and objects. Kent Melton is an amazing and experienced sculptor and I remember seeing the sculpts he did of The Incredibles cast in the movie's art book. Here they are:
the Making of 101 Dalmations video at the 22:31 mark.
Here is (left to right) Production Designer Ken Anderson, Story Artist Bill Peet, Directors Wolfgang Reitherman and Hamilton Luske holding two car models from 101 Dalmations:
Just some Sculpey here:
I had no idea what I was doing. I found the Premo! Sculpey hard to work with. I worked pieces of it at a time in my hands to soften it a bit and then I gradually wrapped strips around the armature to flesh it out.
Scultptors are amazing. This stuff is hard.