There are many different kinds of caterpillars. There is a specific website that is designed to tell you what kind of caterpillar it is. The website is http://www.discoverlife.org/20/q?guide=Caterpillars.
a wooly bear caterpillar
The American Dagger Moth's caterpillar is fuzzy and yellow with what looks like black spikes. But a closer look shows it is just fuzz.
the western web caterpillar
moth
A white caterpillar that is not fuzzy typically has a smooth and shiny body with a solid white color.
the Buff-Tip Moth caterpillar has black stripes, yellow stripes, and fine white hairs or spikes coming off of it. These are generally about 2.5 inches long and eat oak, maple, elm, and hazel leaves.
A white caterpillar with black spikes is known as the Hickory Tussock caterpillar. Beware of picking up this beautiful and unique insect, because they may cause allergic reaction an itching.
Silkworms the caterpillar of the silk moths are white. They eat the leaves of mulberry trees.
This would be a woolly bear caterpillar (banded woolly bear.) They are found through out North American except Canada.
I know what the fuzzy oarnge catterpillar is called, it is called the Tussok Moth Catterpillar I know what the fuzzy oarnge catterpillar is called, it is called the Tussok Moth Catterpillar I know what the fuzzy oarnge catterpillar is called, it is called the Tussok Moth Catterpillar
a tussock moth
The insect you are describing is likely the cinnabar moth (Tyria jacobaeae). The adults have a white fuzzy head with black spots and their wings are white with black spots as well. They are known to feed on poisonous ragwort plants in their caterpillar stage.