This post will show how I use images to help me line up the foam to the dog confirmation. This is extremely important when the client is looking for correct body proportions...etc. The clay-up/skin that is applied with a brush will only be about 1/4" to 1/2" thick; therefore, I try to get as close as possible with the foam armature.
The goal is to try to keep the sculpture as light as possible. The legs need to be able to support the weight of the clay.
I will not be supporting the legs with aluminum rod for this soft coated wheaten terrier, since his legs are short and stocky. Aluminum rods are some time used when the foam legs are not strong enough to support the sculpture. For instance, rods were used on the life sized bronze poodle.